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Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument
of the user address range verification function since we got rid of the
old racy i386-only code to walk page tables by hand.
It existed because the original 80386 would not honor the write protect
bit when in kernel mode, so you had to do COW by hand before doing any
user access. But we haven't supported that in a long time, and these
days the 'type' argument is a purely historical artifact.
A discussion about extending 'user_access_begin()' to do the range
checking resulted this patch, because there is no way we're going to
move the old VERIFY_xyz interface to that model. And it's best done at
the end of the merge window when I've done most of my merges, so let's
just get this done once and for all.
This patch was mostly done with a sed-script, with manual fix-ups for
the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form.
There were a couple of notable cases:
- csky still had the old "verify_area()" name as an alias.
- the iter_iov code had magical hardcoded knowledge of the actual
values of VERIFY_{READ,WRITE} (not that they mattered, since nothing
really used it)
- microblaze used the type argument for a debug printout
but other than those oddities this should be a total no-op patch.
I tried to fix up all architectures, did fairly extensive grepping for
access_ok() uses, and the changes are trivial, but I may have missed
something. Any missed conversion should be trivially fixable, though.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Martin Schwidefsky:
- A larger update for the zcrypt / AP bus code:
+ Update two inline assemblies in the zcrypt driver to make gcc happy
+ Add a missing reply code for invalid special commands for zcrypt
+ Allow AP device reset to be triggered from user space
+ Split the AP scan function into smaller, more readable functions
- Updates for vfio-ccw and vfio-ap
+ Add maintainers and reviewer for vfio-ccw
+ Include facility.h in vfio_ap_drv.c to avoid fragile include chain
+ Simplicy vfio-ccw state machine
- Use the common code version of bust_spinlocks
- Make use of the DEFINE_SHOW_ATTRIBUTE
- Fix three incorrect file permissions in the DASD driver
- Remove bit spin-lock from the PCI interrupt handler
- Fix GFP_ATOMIC vs GFP_KERNEL in the PCI code
* tag 's390-4.21-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/zcrypt: rework ap scan bus code
s390/zcrypt: make sysfs reset attribute trigger queue reset
s390/pci: fix sleeping in atomic during hotplug
s390/pci: remove bit_lock usage in interrupt handler
s390/drivers: fix proc/debugfs file permissions
s390: convert to DEFINE_SHOW_ATTRIBUTE
MAINTAINERS/vfio-ccw: add Farhan and Eric, make Halil Reviewer
vfio: ccw: Merge BUSY and BOXED states
s390: use common bust_spinlocks()
s390/zcrypt: improve special ap message cmd handling
s390/ap: rework assembler functions to use unions for in/out register variables
s390: vfio-ap: include <asm/facility> for test_facility()
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s390 is the only architecture that is using own bust_spinlocks()
variant, while other arch-s seem to be OK with the common
implementation.
Heiko Carstens [1] said he would prefer s390 to use the common
bust_spinlocks() as well:
I did some code archaeology and this function is unchanged since ~17
years. When it was introduced it was close to identical to the x86
variant. All other architectures use the common code variant in the
meantime. So if we change this I'd prefer that we switch s390 to the
common code variant as well. Right now I can't see a reason for not
doing that
This patch removes s390 bust_spinlocks() and drops the weak attribute
from the common bust_spinlocks() version.
[1] lkml.kernel.org/r/20181025062800.GB4037@osiris
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni:
"Subsystem:
- new %ptR printk format
- rename core files
- allow registration of multiple nvmem devices
New driver:
- i.MX system controller RTC
Driver updates:
- abx80x: handle voltage ioctls, correct binding doc
- m41t80: correct month in alarm reads
- pcf85363: add pcf85263 support
- pcf8523: properly handle battery low flag
- s3c: limit alarm to one year in the future as ALMYEAR is broken
- sun6i: rework clock output binding"
* tag 'rtc-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (54 commits)
rtc: rename core files
rtc: nvmem: fix possible use after free
rtc: add i.MX system controller RTC support
dt-bindings: fsl: scu: add rtc binding
rtc: pcf2123: Add Microcrystal rv2123
rtc: class: reimplement devm_rtc_device_register
rtc: enforce rtc_timer_init private_data type
rtc: abx80x: Implement RTC_VL_READ,CLR ioctls
rtc: pcf85363: Add support for NXP pcf85263 rtc
dt-bindings: rtc: pcf85363: Document pcf85263 real-time clock
rtc: pcf8523: don't return invalid date when battery is low
dt-bindings: rtc: use a generic node name for ds1307
PM: Switch to use %ptR
m68k/mac: Switch to use %ptR
Input: hp_sdc_rtc - Switch to use %ptR
rtc: tegra: Switch to use %ptR
rtc: s5m: Switch to use %ptR
rtc: s3c: Switch to use %ptR
rtc: rx8025: Switch to use %ptR
rtc: rx6110: Switch to use %ptR
...
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There are users which print time and date represented by content of
struct rtc_time in human readable format.
Instead of open coding that each time introduce %ptR[dt][r] specifier.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt:
- Rework of the kprobe/uprobe and synthetic events to consolidate all
the dynamic event code. This will make changes in the future easier.
- Partial rewrite of the function graph tracing infrastructure. This
will allow for multiple users of hooking onto functions to get the
callback (return) of the function. This is the ground work for having
kprobes and function graph tracer using one code base.
- Clean up of the histogram code that will facilitate adding more
features to the histograms in the future.
- Addition of str_has_prefix() and a few use cases. There currently is
a similar function strstart() that is used in a few places, but only
returns a bool and not a length. These instances will be removed in
the future to use str_has_prefix() instead.
- A few other various clean ups as well.
* tag 'trace-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (57 commits)
tracing: Use the return of str_has_prefix() to remove open coded numbers
tracing: Have the historgram use the result of str_has_prefix() for len of prefix
tracing: Use str_has_prefix() instead of using fixed sizes
tracing: Use str_has_prefix() helper for histogram code
string.h: Add str_has_prefix() helper function
tracing: Make function ‘ftrace_exports’ static
tracing: Simplify printf'ing in seq_print_sym
tracing: Avoid -Wformat-nonliteral warning
tracing: Merge seq_print_sym_short() and seq_print_sym_offset()
tracing: Add hist trigger comments for variable-related fields
tracing: Remove hist trigger synth_var_refs
tracing: Use hist trigger's var_ref array to destroy var_refs
tracing: Remove open-coding of hist trigger var_ref management
tracing: Use var_refs[] for hist trigger reference checking
tracing: Change strlen to sizeof for hist trigger static strings
tracing: Remove unnecessary hist trigger struct field
tracing: Fix ftrace_graph_get_ret_stack() to use task and not current
seq_buf: Use size_t for len in seq_buf_puts()
seq_buf: Make seq_buf_puts() null-terminate the buffer
arm64: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack
...
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Jann Horn points out that we're using unsigned int for len in
seq_buf_puts(), which could potentially overflow if we're passed a
UINT_MAX sized string.
The rest of the code already uses size_t, so we should also use that
in seq_buf_puts() to avoid any issues.
Link: http://lkml.kernel.org/r/20181019042109.8064-2-mpe@ellerman.id.au
Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Currently seq_buf_puts() will happily create a non null-terminated
string for you in the buffer. This is particularly dangerous if the
buffer is on the stack.
For example:
char buf[8];
char secret = "secret";
struct seq_buf s;
seq_buf_init(&s, buf, sizeof(buf));
seq_buf_puts(&s, "foo");
printk("Message is %s\n", buf);
Can result in:
Message is fooªªªªªsecret
We could require all users to memset() their buffer to zero before
use. But that seems likely to be forgotten and lead to bugs.
Instead we can change seq_buf_puts() to always leave the buffer in a
null-terminated state.
The only downside is that this makes the buffer 1 character smaller
for seq_buf_puts(), but that seems like a good trade off.
Link: http://lkml.kernel.org/r/20181019042109.8064-1-mpe@ellerman.id.au
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kconfig updates from Masahiro Yamada:
- support -y option for merge_config.sh to avoid downgrading =y to =m
- remove S_OTHER symbol type, and touch include/config/*.h files correctly
- fix file name and line number in lexer warnings
- fix memory leak when EOF is encountered in quotation
- resolve all shift/reduce conflicts of the parser
- warn no new line at end of file
- make 'source' statement more strict to take only string literal
- rewrite the lexer and remove the keyword lookup table
- convert to SPDX License Identifier
- compile C files independently instead of including them from zconf.y
- fix various warnings of gconfig
- misc cleanups
* tag 'kconfig-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (39 commits)
kconfig: surround dbg_sym_flags with #ifdef DEBUG to fix gconf warning
kconfig: split images.c out of qconf.cc/gconf.c to fix gconf warnings
kconfig: add static qualifiers to fix gconf warnings
kconfig: split the lexer out of zconf.y
kconfig: split some C files out of zconf.y
kconfig: convert to SPDX License Identifier
kconfig: remove keyword lookup table entirely
kconfig: update current_pos in the second lexer
kconfig: switch to ASSIGN_VAL state in the second lexer
kconfig: stop associating kconf_id with yylval
kconfig: refactor end token rules
kconfig: stop supporting '.' and '/' in unquoted words
treewide: surround Kconfig file paths with double quotes
microblaze: surround string default in Kconfig with double quotes
kconfig: use T_WORD instead of T_VARIABLE for variables
kconfig: use specific tokens instead of T_ASSIGN for assignments
kconfig: refactor scanning and parsing "option" properties
kconfig: use distinct tokens for type and default properties
kconfig: remove redundant token defines
kconfig: rename depends_list to comment_option_list
...
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The Kconfig lexer supports special characters such as '.' and '/' in
the parameter context. In my understanding, the reason is just to
support bare file paths in the source statement.
I do not see a good reason to complicate Kconfig for the room of
ambiguity.
The majority of code already surrounds file paths with double quotes,
and it makes sense since file paths are constant string literals.
Make it treewide consistent now.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
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gen_crc64table requires linux include files to be installed in
/usr/include/linux. This is a new requrement so hosts that could
previously build the kernel, now cannot.
gen_crc64table makes this requirement by including <linux/swab.h>, but
nothing from that header is actaully used.
So remove the #include, so that the linux headers no longer need to be
installed.
Fixes: feba04fd2cf8 ("lib: add crc64 calculation routines")
Signed-off-by: NeilBrown <neil@brown.name>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is the "big" set of driver core patches for 4.21-rc1.
It's not really big, just a number of small changes for some reported
issues, some documentation updates to hopefully make it harder for
people to abuse the driver model, and some other minor cleanups.
All of these have been in linux-next for a while with no reported
issues"
* tag 'driver-core-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
mm, memory_hotplug: update a comment in unregister_memory()
component: convert to DEFINE_SHOW_ATTRIBUTE
sysfs: Disable lockdep for driver bind/unbind files
driver core: Add missing dev->bus->need_parent_lock checks
kobject: return error code if writing /sys/.../uevent fails
driver core: Move async_synchronize_full call
driver core: platform: Respect return code of platform_device_register_full()
kref/kobject: Improve documentation
drivers/base/memory.c: Use DEVICE_ATTR_RO and friends
driver core: Replace simple_strto{l,ul} by kstrtou{l,ul}
kernfs: Improve kernfs_notify() poll notification latency
kobject: Fix warnings in lib/kobject_uevent.c
kobject: drop unnecessary cast "%llu" for u64
driver core: fix comments for device_block_probing()
driver core: Replace simple_strtol by kstrtoint
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The current kref and kobject documentation may be
insufficient to understand these common pitfalls regarding
object lifetime and object releasing.
Add a bit more documentation and improve the warnings
seen by the user, pointing to the right piece of documentation.
Also, it's important to understand that making fun of people
publicly is not at all helpful, doesn't provide any value,
and it's not a healthy way of encouraging developers to do better.
"Mocking mercilessly" will, if anything, make developers feel bad
and go away. This kind of behavior should not be encouraged or justified.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We need the fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Add a blank after declaration.
Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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There is no searon for u64 var cast to unsigned long long type.
Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial driver updates from Greg KH:
"Here is the large TTY/Serial driver set of patches for 4.21-rc1.
A number of small serial driver changes along with some good tty core
fixes for long-reported issues with locking. There is also a new
console font added to the tree, for high-res screens, so that should
be helpful for many.
The last patch in the series is a revert of an older one in the tree,
it came late but it resolves a reported issue that linux-next was
having for some people.
Full details are in the shortlog, and all of these, with the exception
of the revert, have been in linux-next for a while with no reported
issues"
* tag 'tty-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (85 commits)
Revert "serial: 8250: Default SERIAL_OF_PLATFORM to SERIAL_8250"
serial: sccnxp: Allow to use non-standard baud rates
serial: sccnxp: Adds a delay between sequential read/write cycles
tty: serial: qcom_geni_serial: Fix UART hang
tty: serial: qcom_geni_serial: Fix wrap around of TX buffer
serial: max310x: Fix tx_empty() callback
dt-bindings: serial: sh-sci: Document r8a774c0 bindings
dt-bindings: serial: sh-sci: Document r8a774a1 bindings
Fonts: New Terminus large console font
dt-bindings: serial: lpuart: add imx8qxp compatible string
serial: uartps: Fix interrupt mask issue to handle the RX interrupts properly
serial: uartps: Fix error path when alloc failed
serial: uartps: Check if the device is a console
serial: uartps: Add the device_init_wakeup
tty: serial: samsung: Increase maximum baudrate
tty: serial: samsung: Properly set flags in autoCTS mode
tty: Use of_node_name_{eq,prefix} for node name comparisons
tty/serial: do not free trasnmit buffer page under port lock
serial: 8250: Rate limit serial port rx interrupts during input overruns
dt-bindings: serial: 8250: Add rate limit for serial port input overruns
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This patch adds an option to compile-in a high resolution
and large Terminus (ter16x32) bitmap console font for use with
HiDPI and Retina screens.
The font was convereted from standard Terminus ter-i32b.psf
(size 16x32) with the help of psftools and minor hand editing
deleting useless characters.
This patch is non-intrusive, no options are enabled by default so most
users won't notice a thing.
I am placing my changes under the GPL 2.0 just as source Terminus font.
Signed-off-by: Amanoel Dawod <amanoeladawod@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge misc updates from Andrew Morton:
- large KASAN update to use arm's "software tag-based mode"
- a few misc things
- sh updates
- ocfs2 updates
- just about all of MM
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (167 commits)
kernel/fork.c: mark 'stack_vm_area' with __maybe_unused
memcg, oom: notify on oom killer invocation from the charge path
mm, swap: fix swapoff with KSM pages
include/linux/gfp.h: fix typo
mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm
hugetlbfs: Use i_mmap_rwsem to fix page fault/truncate race
hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization
memory_hotplug: add missing newlines to debugging output
mm: remove __hugepage_set_anon_rmap()
include/linux/vmstat.h: remove unused page state adjustment macro
mm/page_alloc.c: allow error injection
mm: migrate: drop unused argument of migrate_page_move_mapping()
blkdev: avoid migration stalls for blkdev pages
mm: migrate: provide buffer_migrate_page_norefs()
mm: migrate: move migrate_page_lock_buffers()
mm: migrate: lock buffers before migrate_page_move_mapping()
mm: migration: factor out code to compute expected number of page references
mm, page_alloc: enable pcpu_drain with zone capability
kmemleak: add config to select auto scan
mm/page_alloc.c: don't call kasan_free_pages() at deferred mem init
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Kmemleak scan can be cpu intensive and can stall user tasks at times. To
prevent this, add config DEBUG_KMEMLEAK_AUTO_SCAN to enable/disable auto
scan on boot up. Also protect first_run with DEBUG_KMEMLEAK_AUTO_SCAN as
this is meant for only first automatic scan.
Link: http://lkml.kernel.org/r/1540231723-7087-1-git-send-email-prpatel@nvidia.com
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Signed-off-by: Sachin Nikam <snikam@nvidia.com>
Signed-off-by: Prateek <prpatel@nvidia.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Whilst no architectures actually enable support for huge p4d mappings in
the vmap area, the code that is implemented should be using
break-before-make, as we do for pud and pmd huge entries.
Link: http://lkml.kernel.org/r/1544120495-17438-6-git-send-email-will.deacon@arm.com
Signed-off-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Chintan Pandya <cpandya@codeaurora.org>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The current ioremap() code uses a phys_addr variable at each level of page
table, which is confusingly offset by subtracting the base virtual address
being mapped so that adding the current virtual address back on when
iterating through the page table entries gives back the corresponding
physical address.
This is fairly confusing and results in all users of phys_addr having to
add the current virtual address back on. Instead, this patch just updates
phys_addr when iterating over the page table entries, ensuring that it's
always up-to-date and doesn't require explicit offsetting.
Link: http://lkml.kernel.org/r/1544120495-17438-5-git-send-email-will.deacon@arm.com
Signed-off-by: Will Deacon <will.deacon@arm.com>
Tested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Chintan Pandya <cpandya@codeaurora.org>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The recently merged API for ensuring break-before-make on page-table
entries when installing huge mappings in the vmalloc/ioremap region is
fairly counter-intuitive, resulting in the arch freeing functions (e.g.
pmd_free_pte_page()) being called even on entries that aren't present.
This resulted in a minor bug in the arm64 implementation, giving rise to
spurious VM_WARN messages.
This patch moves the pXd_present() checks out into the core code,
refactoring the callsites at the same time so that we avoid the complex
conjunctions when determining whether or not we can put down a huge
mapping.
Link: http://lkml.kernel.org/r/1544120495-17438-2-git-send-email-will.deacon@arm.com
Signed-off-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Chintan Pandya <cpandya@codeaurora.org>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Function show_mem() is used to print system memory status when user
requires or fail to allocate memory. Generally, this is a best effort
information so any races with memory hotplug (or very theoretically an
early initialization) should be tolerable and the worst that could happen
is to print an imprecise node state.
Drop the resize lock because this is the only place which might hold the
lock from the interrupt context and so all other callers might use a
simple spinlock. Even though this doesn't solve any real issue it makes
the code easier to follow and tiny more effective.
Link: http://lkml.kernel.org/r/20181129235532.9328-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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totalram_pages, zone->managed_pages and totalhigh_pages updates are
protected by managed_page_count_lock, but readers never care about it.
Convert these variables to atomic to avoid readers potentially seeing a
store tear.
This patch converts zone->managed_pages. Subsequent patches will convert
totalram_panges, totalhigh_pages and eventually managed_page_count_lock
will be removed.
Main motivation was that managed_page_count_lock handling was complicating
things. It was discussed in length here,
https://lore.kernel.org/patchwork/patch/995739/#1181785 So it seemes
better to remove the lock and convert variables to atomic, with preventing
poteintial store-to-read tearing as a bonus.
Link: http://lkml.kernel.org/r/1542090790-21750-3-git-send-email-arunks@codeaurora.org
Signed-off-by: Arun KS <arunks@codeaurora.org>
Suggested-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The current value of the early boot static pool size, 1024 is not big
enough for systems with large number of CPUs with timer or/and workqueue
objects selected. As the results, systems have 60+ CPUs with both timer
and workqueue objects enabled could trigger "ODEBUG: Out of memory.
ODEBUG disabled".
Some debug objects are allocated during the early boot. Enabling some
options like timers or workqueue objects may increase the size required
significantly with large number of CPUs. For example,
CONFIG_DEBUG_OBJECTS_TIMERS:
No. CPUs x 2 (worker pool) objects:
start_kernel
workqueue_init_early
init_worker_pool
init_timer_key
debug_object_init
plus No. CPUs objects (CONFIG_HIGH_RES_TIMERS):
sched_init
hrtick_rq_init
hrtimer_init
CONFIG_DEBUG_OBJECTS_WORK:
No. CPUs objects:
vmalloc_init
__init_work
plus No. CPUs x 6 (workqueue) objects:
workqueue_init_early
alloc_workqueue
__alloc_workqueue_key
alloc_and_link_pwqs
init_pwq
Also, plus No. CPUs objects:
perf_event_init
__init_srcu_struct
init_srcu_struct_fields
init_srcu_struct_nodes
__init_work
However, none of the things are actually used or required before
debug_objects_mem_init() is invoked, so just move the call right before
vmalloc_init().
According to tglx, "the reason why the call is at this place in
start_kernel() is historical. It's because back in the days when
debugobjects were added the memory allocator was enabled way later than
today."
Link: http://lkml.kernel.org/r/20181126102407.1836-1-cai@gmx.us
Signed-off-by: Qian Cai <cai@gmx.us>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This commit splits the current CONFIG_KASAN config option into two:
1. CONFIG_KASAN_GENERIC, that enables the generic KASAN mode (the one
that exists now);
2. CONFIG_KASAN_SW_TAGS, that enables the software tag-based KASAN mode.
The name CONFIG_KASAN_SW_TAGS is chosen as in the future we will have
another hardware tag-based KASAN mode, that will rely on hardware memory
tagging support in arm64.
With CONFIG_KASAN_SW_TAGS enabled, compiler options are changed to
instrument kernel files with -fsantize=kernel-hwaddress (except the ones
for which KASAN_SANITIZE := n is set).
Both CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS support both
CONFIG_KASAN_INLINE and CONFIG_KASAN_OUTLINE instrumentation modes.
This commit also adds empty placeholder (for now) implementation of
tag-based KASAN specific hooks inserted by the compiler and adjusts
common hooks implementation.
While this commit adds the CONFIG_KASAN_SW_TAGS config option, this option
is not selectable, as it depends on HAVE_ARCH_KASAN_SW_TAGS, which we will
enable once all the infrastracture code has been added.
Link: http://lkml.kernel.org/r/b2550106eb8a68b10fefbabce820910b115aa853.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Pull DMA mapping updates from Christoph Hellwig:
"A huge update this time, but a lot of that is just consolidating or
removing code:
- provide a common DMA_MAPPING_ERROR definition and avoid indirect
calls for dma_map_* error checking
- use direct calls for the DMA direct mapping case, avoiding huge
retpoline overhead for high performance workloads
- merge the swiotlb dma_map_ops into dma-direct
- provide a generic remapping DMA consistent allocator for
architectures that have devices that perform DMA that is not cache
coherent. Based on the existing arm64 implementation and also used
for csky now.
- improve the dma-debug infrastructure, including dynamic allocation
of entries (Robin Murphy)
- default to providing chaining scatterlist everywhere, with opt-outs
for the few architectures (alpha, parisc, most arm32 variants) that
can't cope with it
- misc sparc32 dma-related cleanups
- remove the dma_mark_clean arch hook used by swiotlb on ia64 and
replace it with the generic noncoherent infrastructure
- fix the return type of dma_set_max_seg_size (Niklas Söderlund)
- move the dummy dma ops for not DMA capable devices from arm64 to
common code (Robin Murphy)
- ensure dma_alloc_coherent returns zeroed memory to avoid kernel
data leaks through userspace. We already did this for most common
architectures, but this ensures we do it everywhere.
dma_zalloc_coherent has been deprecated and can hopefully be
removed after -rc1 with a coccinelle script"
* tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping: (73 commits)
dma-mapping: fix inverted logic in dma_supported
dma-mapping: deprecate dma_zalloc_coherent
dma-mapping: zero memory returned from dma_alloc_*
sparc/iommu: fix ->map_sg return value
sparc/io-unit: fix ->map_sg return value
arm64: default to the direct mapping in get_arch_dma_ops
PCI: Remove unused attr variable in pci_dma_configure
ia64: only select ARCH_HAS_DMA_COHERENT_TO_PFN if swiotlb is enabled
dma-mapping: bypass indirect calls for dma-direct
vmd: use the proper dma_* APIs instead of direct methods calls
dma-direct: merge swiotlb_dma_ops into the dma_direct code
dma-direct: use dma_direct_map_page to implement dma_direct_map_sg
dma-direct: improve addressability error reporting
swiotlb: remove dma_mark_clean
swiotlb: remove SWIOTLB_MAP_ERROR
ACPI / scan: Refactor _CCA enforcement
dma-mapping: factor out dummy DMA ops
dma-mapping: always build the direct mapping code
dma-mapping: move dma_cache_sync out of line
dma-mapping: move various slow path functions out of line
...
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These days architectures are mostly out of the business of dealing with
struct scatterlist at all, unless they have architecture specific iommu
drivers. Replace the ARCH_HAS_SG_CHAIN symbol with a ARCH_NO_SG_CHAIN
one only enabled for architectures with horrible legacy iommu drivers
like alpha and parisc, and conditionally for arm which wants to keep it
disable for legacy platforms.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
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Pull block updates from Jens Axboe:
"This is the main pull request for block/storage for 4.21.
Larger than usual, it was a busy round with lots of goodies queued up.
Most notable is the removal of the old IO stack, which has been a long
time coming. No new features for a while, everything coming in this
week has all been fixes for things that were previously merged.
This contains:
- Use atomic counters instead of semaphores for mtip32xx (Arnd)
- Cleanup of the mtip32xx request setup (Christoph)
- Fix for circular locking dependency in loop (Jan, Tetsuo)
- bcache (Coly, Guoju, Shenghui)
* Optimizations for writeback caching
* Various fixes and improvements
- nvme (Chaitanya, Christoph, Sagi, Jay, me, Keith)
* host and target support for NVMe over TCP
* Error log page support
* Support for separate read/write/poll queues
* Much improved polling
* discard OOM fallback
* Tracepoint improvements
- lightnvm (Hans, Hua, Igor, Matias, Javier)
* Igor added packed metadata to pblk. Now drives without metadata
per LBA can be used as well.
* Fix from Geert on uninitialized value on chunk metadata reads.
* Fixes from Hans and Javier to pblk recovery and write path.
* Fix from Hua Su to fix a race condition in the pblk recovery
code.
* Scan optimization added to pblk recovery from Zhoujie.
* Small geometry cleanup from me.
- Conversion of the last few drivers that used the legacy path to
blk-mq (me)
- Removal of legacy IO path in SCSI (me, Christoph)
- Removal of legacy IO stack and schedulers (me)
- Support for much better polling, now without interrupts at all.
blk-mq adds support for multiple queue maps, which enables us to
have a map per type. This in turn enables nvme to have separate
completion queues for polling, which can then be interrupt-less.
Also means we're ready for async polled IO, which is hopefully
coming in the next release.
- Killing of (now) unused block exports (Christoph)
- Unification of the blk-rq-qos and blk-wbt wait handling (Josef)
- Support for zoned testing with null_blk (Masato)
- sx8 conversion to per-host tag sets (Christoph)
- IO priority improvements (Damien)
- mq-deadline zoned fix (Damien)
- Ref count blkcg series (Dennis)
- Lots of blk-mq improvements and speedups (me)
- sbitmap scalability improvements (me)
- Make core inflight IO accounting per-cpu (Mikulas)
- Export timeout setting in sysfs (Weiping)
- Cleanup the direct issue path (Jianchao)
- Export blk-wbt internals in block debugfs for easier debugging
(Ming)
- Lots of other fixes and improvements"
* tag 'for-4.21/block-20181221' of git://git.kernel.dk/linux-block: (364 commits)
kyber: use sbitmap add_wait_queue/list_del wait helpers
sbitmap: add helpers for add/del wait queue handling
block: save irq state in blkg_lookup_create()
dm: don't reuse bio for flushes
nvme-pci: trace SQ status on completions
nvme-rdma: implement polling queue map
nvme-fabrics: allow user to pass in nr_poll_queues
nvme-fabrics: allow nvmf_connect_io_queue to poll
nvme-core: optionally poll sync commands
block: make request_to_qc_t public
nvme-tcp: fix spelling mistake "attepmpt" -> "attempt"
nvme-tcp: fix endianess annotations
nvmet-tcp: fix endianess annotations
nvme-pci: refactor nvme_poll_irqdisable to make sparse happy
nvme-pci: only set nr_maps to 2 if poll queues are supported
nvmet: use a macro for default error location
nvmet: fix comparison of a u16 with -1
blk-mq: enable IO poll if .nr_queues of type poll > 0
blk-mq: change blk_mq_queue_busy() to blk_mq_queue_inflight()
blk-mq: skip zero-queue maps in blk_mq_map_swqueue
...
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After commit 5d2ee7122c73, users of sbitmap that need wait queue
handling must use the provided helpers. But we only added
prepare_to_wait()/finish_wait() style helpers, add the equivalent
add_wait_queue/list_del wrappers as we..
This is needed to ensure kyber plays by the sbitmap waitqueue
rules.
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Allow consumers that want to use iov iterator helpers and also update
a predefined hash calculation online when copying data. This is useful
when copying incoming network buffers to a local iterator and calculate
a digest on the incoming stream. nvme-tcp host driver that will be
introduced in following patches is the first consumer via
skb_copy_and_hash_datagram_iter.
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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The single caller to csum_and_copy_to_iter is skb_copy_and_csum_datagram
and we are trying to unite its logic with skb_copy_datagram_iter by passing
a callback to the copy function that we want to apply. Thus, we need
to make the checksum pointer private to the function.
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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We're missing a deferred clear off the shallow get, which can cause
a hang. Additionally, when we resize the sbitmap, we should also
flush deferred clears for good measure.
Ensure we have full coverage on batch clears, even for paths where
we would not be doing deferred clear. This makes it less error
prone for future additions.
Reported-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Ming reports that lockdep spews the following trace. What this
essentially says is that the sbitmap swap_lock was used inconsistently
in IRQ enabled and disabled context, and that is usually indicative of a
bug that will cause a deadlock.
For this case, it's a false positive. The swap_lock is used from process
context only, when we swap the bits in the word and cleared mask. We
also end up doing that when we are getting a driver tag, from the
blk_mq_mark_tag_wait(), and from there we hold the waitqueue lock with
IRQs disabled. However, this isn't from an actual IRQ, it's still
process context.
In lieu of a better way to fix this, simply always disable interrupts
when grabbing the swap_lock if lockdep is enabled.
[ 100.967642] ================start test sanity/001================
[ 101.238280] null: module loaded
[ 106.093735]
[ 106.094012] =====================================================
[ 106.094854] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
[ 106.095759] 4.20.0-rc3_5d2ee7122c73_for-next+ #1 Not tainted
[ 106.096551] -----------------------------------------------------
[ 106.097386] fio/1043 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[ 106.098231] 000000004c43fa71
(&(&sb->map[i].swap_lock)->rlock){+.+.}, at: sbitmap_get+0xd5/0x22c
[ 106.099431]
[ 106.099431] and this task is already holding:
[ 106.100229] 000000007eec8b2f
(&(&hctx->dispatch_wait_lock)->rlock){....}, at:
blk_mq_dispatch_rq_list+0x4c1/0xd7c
[ 106.101630] which would create a new lock dependency:
[ 106.102326] (&(&hctx->dispatch_wait_lock)->rlock){....} ->
(&(&sb->map[i].swap_lock)->rlock){+.+.}
[ 106.103553]
[ 106.103553] but this new dependency connects a SOFTIRQ-irq-safe lock:
[ 106.104580] (&sbq->ws[i].wait){..-.}
[ 106.104582]
[ 106.104582] ... which became SOFTIRQ-irq-safe at:
[ 106.105751] _raw_spin_lock_irqsave+0x4b/0x82
[ 106.106284] __wake_up_common_lock+0x119/0x1b9
[ 106.106825] sbitmap_queue_wake_up+0x33f/0x383
[ 106.107456] sbitmap_queue_clear+0x4c/0x9a
[ 106.108046] __blk_mq_free_request+0x188/0x1d3
[ 106.108581] blk_mq_free_request+0x23b/0x26b
[ 106.109102] scsi_end_request+0x345/0x5d7
[ 106.109587] scsi_io_completion+0x4b5/0x8f0
[ 106.110099] scsi_finish_command+0x412/0x456
[ 106.110615] scsi_softirq_done+0x23f/0x29b
[ 106.111115] blk_done_softirq+0x2a7/0x2e6
[ 106.111608] __do_softirq+0x360/0x6ad
[ 106.112062] run_ksoftirqd+0x2f/0x5b
[ 106.112499] smpboot_thread_fn+0x3a5/0x3db
[ 106.113000] kthread+0x1d4/0x1e4
[ 106.113457] ret_from_fork+0x3a/0x50
[ 106.113969]
[ 106.113969] to a SOFTIRQ-irq-unsafe lock:
[ 106.114672] (&(&sb->map[i].swap_lock)->rlock){+.+.}
[ 106.114674]
[ 106.114674] ... which became SOFTIRQ-irq-unsafe at:
[ 106.116000] ...
[ 106.116003] _raw_spin_lock+0x33/0x64
[ 106.116676] sbitmap_get+0xd5/0x22c
[ 106.117134] __sbitmap_queue_get+0xe8/0x177
[ 106.117731] __blk_mq_get_tag+0x1e6/0x22d
[ 106.118286] blk_mq_get_tag+0x1db/0x6e4
[ 106.118756] blk_mq_get_driver_tag+0x161/0x258
[ 106.119383] blk_mq_dispatch_rq_list+0x28e/0xd7c
[ 106.120043] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.120607] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.121234] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.121781] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.122366] blk_mq_run_hw_queue+0x151/0x187
[ 106.122887] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.123492] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.124042] blk_flush_plug_list+0x392/0x3d7
[ 106.124557] blk_finish_plug+0x37/0x4f
[ 106.125019] read_pages+0x3ef/0x430
[ 106.125446] __do_page_cache_readahead+0x18e/0x2fc
[ 106.126027] force_page_cache_readahead+0x121/0x133
[ 106.126621] page_cache_sync_readahead+0x35f/0x3bb
[ 106.127229] generic_file_buffered_read+0x410/0x1860
[ 106.127932] __vfs_read+0x319/0x38f
[ 106.128415] vfs_read+0xd2/0x19a
[ 106.128817] ksys_read+0xb9/0x135
[ 106.129225] do_syscall_64+0x140/0x385
[ 106.129684] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.130292]
[ 106.130292] other info that might help us debug this:
[ 106.130292]
[ 106.131226] Chain exists of:
[ 106.131226] &sbq->ws[i].wait -->
&(&hctx->dispatch_wait_lock)->rlock -->
&(&sb->map[i].swap_lock)->rlock
[ 106.131226]
[ 106.132865] Possible interrupt unsafe locking scenario:
[ 106.132865]
[ 106.133659] CPU0 CPU1
[ 106.134194] ---- ----
[ 106.134733] lock(&(&sb->map[i].swap_lock)->rlock);
[ 106.135318] local_irq_disable();
[ 106.136014] lock(&sbq->ws[i].wait);
[ 106.136747]
lock(&(&hctx->dispatch_wait_lock)->rlock);
[ 106.137742] <Interrupt>
[ 106.138110] lock(&sbq->ws[i].wait);
[ 106.138625]
[ 106.138625] *** DEADLOCK ***
[ 106.138625]
[ 106.139430] 3 locks held by fio/1043:
[ 106.139947] #0: 0000000076ff0fd9 (rcu_read_lock){....}, at:
hctx_lock+0x29/0xe8
[ 106.140813] #1: 000000002feb1016 (&sbq->ws[i].wait){..-.}, at:
blk_mq_dispatch_rq_list+0x4ad/0xd7c
[ 106.141877] #2: 000000007eec8b2f
(&(&hctx->dispatch_wait_lock)->rlock){....}, at:
blk_mq_dispatch_rq_list+0x4c1/0xd7c
[ 106.143267]
[ 106.143267] the dependencies between SOFTIRQ-irq-safe lock and the
holding lock:
[ 106.144351] -> (&sbq->ws[i].wait){..-.} ops: 82 {
[ 106.144926] IN-SOFTIRQ-W at:
[ 106.145314] _raw_spin_lock_irqsave+0x4b/0x82
[ 106.146042] __wake_up_common_lock+0x119/0x1b9
[ 106.146785] sbitmap_queue_wake_up+0x33f/0x383
[ 106.147567] sbitmap_queue_clear+0x4c/0x9a
[ 106.148379] __blk_mq_free_request+0x188/0x1d3
[ 106.149148] blk_mq_free_request+0x23b/0x26b
[ 106.149864] scsi_end_request+0x345/0x5d7
[ 106.150546] scsi_io_completion+0x4b5/0x8f0
[ 106.151367] scsi_finish_command+0x412/0x456
[ 106.152157] scsi_softirq_done+0x23f/0x29b
[ 106.152855] blk_done_softirq+0x2a7/0x2e6
[ 106.153537] __do_softirq+0x360/0x6ad
[ 106.154280] run_ksoftirqd+0x2f/0x5b
[ 106.155020] smpboot_thread_fn+0x3a5/0x3db
[ 106.155828] kthread+0x1d4/0x1e4
[ 106.156526] ret_from_fork+0x3a/0x50
[ 106.157267] INITIAL USE at:
[ 106.157713] _raw_spin_lock_irqsave+0x4b/0x82
[ 106.158542] prepare_to_wait_exclusive+0xa8/0x215
[ 106.159421] blk_mq_get_tag+0x34f/0x6e4
[ 106.160186] blk_mq_get_request+0x48e/0xaef
[ 106.160997] blk_mq_make_request+0x27e/0xbd2
[ 106.161828] generic_make_request+0x4d1/0x873
[ 106.162661] submit_bio+0x20c/0x253
[ 106.163379] mpage_bio_submit+0x44/0x4b
[ 106.164142] mpage_readpages+0x3c2/0x407
[ 106.164919] read_pages+0x13a/0x430
[ 106.165633] __do_page_cache_readahead+0x18e/0x2fc
[ 106.166530] force_page_cache_readahead+0x121/0x133
[ 106.167439] page_cache_sync_readahead+0x35f/0x3bb
[ 106.168337] generic_file_buffered_read+0x410/0x1860
[ 106.169255] __vfs_read+0x319/0x38f
[ 106.169977] vfs_read+0xd2/0x19a
[ 106.170662] ksys_read+0xb9/0x135
[ 106.171356] do_syscall_64+0x140/0x385
[ 106.172120] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.173051] }
[ 106.173308] ... key at: [<ffffffff85094600>] __key.26481+0x0/0x40
[ 106.174219] ... acquired at:
[ 106.174646] _raw_spin_lock+0x33/0x64
[ 106.175183] blk_mq_dispatch_rq_list+0x4c1/0xd7c
[ 106.175843] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.176518] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.177262] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.177900] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.178591] blk_mq_run_hw_queue+0x151/0x187
[ 106.179207] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.179926] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.180571] blk_flush_plug_list+0x392/0x3d7
[ 106.181187] blk_finish_plug+0x37/0x4f
[ 106.181737] __se_sys_io_submit+0x171/0x304
[ 106.182346] do_syscall_64+0x140/0x385
[ 106.182895] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.183607]
[ 106.183830] -> (&(&hctx->dispatch_wait_lock)->rlock){....} ops: 1 {
[ 106.184691] INITIAL USE at:
[ 106.185119] _raw_spin_lock+0x33/0x64
[ 106.185838] blk_mq_dispatch_rq_list+0x4c1/0xd7c
[ 106.186697] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.187551] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.188481] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.189307] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.190189] blk_mq_run_hw_queue+0x151/0x187
[ 106.190989] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.191902] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.192739] blk_flush_plug_list+0x392/0x3d7
[ 106.193535] blk_finish_plug+0x37/0x4f
[ 106.194269] __se_sys_io_submit+0x171/0x304
[ 106.195059] do_syscall_64+0x140/0x385
[ 106.195794] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.196705] }
[ 106.196950] ... key at: [<ffffffff84880620>] __key.51231+0x0/0x40
[ 106.197853] ... acquired at:
[ 106.198270] lock_acquire+0x280/0x2f3
[ 106.198806] _raw_spin_lock+0x33/0x64
[ 106.199337] sbitmap_get+0xd5/0x22c
[ 106.199850] __sbitmap_queue_get+0xe8/0x177
[ 106.200450] __blk_mq_get_tag+0x1e6/0x22d
[ 106.201035] blk_mq_get_tag+0x1db/0x6e4
[ 106.201589] blk_mq_get_driver_tag+0x161/0x258
[ 106.202237] blk_mq_dispatch_rq_list+0x5b9/0xd7c
[ 106.202902] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.203572] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.204316] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.204956] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.205649] blk_mq_run_hw_queue+0x151/0x187
[ 106.206269] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.206997] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.207644] blk_flush_plug_list+0x392/0x3d7
[ 106.208264] blk_finish_plug+0x37/0x4f
[ 106.208814] __se_sys_io_submit+0x171/0x304
[ 106.209415] do_syscall_64+0x140/0x385
[ 106.209965] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.210684]
[ 106.210904]
[ 106.210904] the dependencies between the lock to be acquired
[ 106.210905] and SOFTIRQ-irq-unsafe lock:
[ 106.212541] -> (&(&sb->map[i].swap_lock)->rlock){+.+.} ops: 1969 {
[ 106.213393] HARDIRQ-ON-W at:
[ 106.213840] _raw_spin_lock+0x33/0x64
[ 106.214570] sbitmap_get+0xd5/0x22c
[ 106.215282] __sbitmap_queue_get+0xe8/0x177
[ 106.216086] __blk_mq_get_tag+0x1e6/0x22d
[ 106.216876] blk_mq_get_tag+0x1db/0x6e4
[ 106.217627] blk_mq_get_driver_tag+0x161/0x258
[ 106.218465] blk_mq_dispatch_rq_list+0x28e/0xd7c
[ 106.219326] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.220198] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.221138] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.221975] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.222874] blk_mq_run_hw_queue+0x151/0x187
[ 106.223686] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.224597] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.225444] blk_flush_plug_list+0x392/0x3d7
[ 106.226255] blk_finish_plug+0x37/0x4f
[ 106.227006] read_pages+0x3ef/0x430
[ 106.227717] __do_page_cache_readahead+0x18e/0x2fc
[ 106.228595] force_page_cache_readahead+0x121/0x133
[ 106.229491] page_cache_sync_readahead+0x35f/0x3bb
[ 106.230373] generic_file_buffered_read+0x410/0x1860
[ 106.231277] __vfs_read+0x319/0x38f
[ 106.231986] vfs_read+0xd2/0x19a
[ 106.232666] ksys_read+0xb9/0x135
[ 106.233350] do_syscall_64+0x140/0x385
[ 106.234097] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.235012] SOFTIRQ-ON-W at:
[ 106.235460] _raw_spin_lock+0x33/0x64
[ 106.236195] sbitmap_get+0xd5/0x22c
[ 106.236913] __sbitmap_queue_get+0xe8/0x177
[ 106.237715] __blk_mq_get_tag+0x1e6/0x22d
[ 106.238488] blk_mq_get_tag+0x1db/0x6e4
[ 106.239244] blk_mq_get_driver_tag+0x161/0x258
[ 106.240079] blk_mq_dispatch_rq_list+0x28e/0xd7c
[ 106.240937] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.241806] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.242751] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.243579] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.244469] blk_mq_run_hw_queue+0x151/0x187
[ 106.245277] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.246191] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.247044] blk_flush_plug_list+0x392/0x3d7
[ 106.247859] blk_finish_plug+0x37/0x4f
[ 106.248749] read_pages+0x3ef/0x430
[ 106.249463] __do_page_cache_readahead+0x18e/0x2fc
[ 106.250357] force_page_cache_readahead+0x121/0x133
[ 106.251263] page_cache_sync_readahead+0x35f/0x3bb
[ 106.252157] generic_file_buffered_read+0x410/0x1860
[ 106.253084] __vfs_read+0x319/0x38f
[ 106.253808] vfs_read+0xd2/0x19a
[ 106.254488] ksys_read+0xb9/0x135
[ 106.255186] do_syscall_64+0x140/0x385
[ 106.255943] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.256867] INITIAL USE at:
[ 106.257300] _raw_spin_lock+0x33/0x64
[ 106.258033] sbitmap_get+0xd5/0x22c
[ 106.258747] __sbitmap_queue_get+0xe8/0x177
[ 106.259542] __blk_mq_get_tag+0x1e6/0x22d
[ 106.260320] blk_mq_get_tag+0x1db/0x6e4
[ 106.261072] blk_mq_get_driver_tag+0x161/0x258
[ 106.261902] blk_mq_dispatch_rq_list+0x28e/0xd7c
[ 106.262762] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.263626] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.264571] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.265409] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.266302] blk_mq_run_hw_queue+0x151/0x187
[ 106.267111] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.268028] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.268878] blk_flush_plug_list+0x392/0x3d7
[ 106.269694] blk_finish_plug+0x37/0x4f
[ 106.270432] read_pages+0x3ef/0x430
[ 106.271139] __do_page_cache_readahead+0x18e/0x2fc
[ 106.272040] force_page_cache_readahead+0x121/0x133
[ 106.272932] page_cache_sync_readahead+0x35f/0x3bb
[ 106.273811] generic_file_buffered_read+0x410/0x1860
[ 106.274709] __vfs_read+0x319/0x38f
[ 106.275407] vfs_read+0xd2/0x19a
[ 106.276074] ksys_read+0xb9/0x135
[ 106.276764] do_syscall_64+0x140/0x385
[ 106.277500] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 106.278417] }
[ 106.278676] ... key at: [<ffffffff85094640>] __key.26212+0x0/0x40
[ 106.279586] ... acquired at:
[ 106.280026] lock_acquire+0x280/0x2f3
[ 106.280559] _raw_spin_lock+0x33/0x64
[ 106.281101] sbitmap_get+0xd5/0x22c
[ 106.281610] __sbitmap_queue_get+0xe8/0x177
[ 106.282221] __blk_mq_get_tag+0x1e6/0x22d
[ 106.282809] blk_mq_get_tag+0x1db/0x6e4
[ 106.283368] blk_mq_get_driver_tag+0x161/0x258
[ 106.284018] blk_mq_dispatch_rq_list+0x5b9/0xd7c
[ 106.284685] blk_mq_do_dispatch_sched+0x23a/0x287
[ 106.285371] blk_mq_sched_dispatch_requests+0x379/0x3fc
[ 106.286135] __blk_mq_run_hw_queue+0x137/0x17e
[ 106.286806] __blk_mq_delay_run_hw_queue+0x80/0x25f
[ 106.287515] blk_mq_run_hw_queue+0x151/0x187
[ 106.288149] blk_mq_sched_insert_requests+0x13f/0x175
[ 106.289041] blk_mq_flush_plug_list+0x7d6/0x81b
[ 106.289912] blk_flush_plug_list+0x392/0x3d7
[ 106.290590] blk_finish_plug+0x37/0x4f
[ 106.291238] __se_sys_io_submit+0x171/0x304
[ 106.291864] do_syscall_64+0x140/0x385
[ 106.292534] entry_SYSCALL_64_after_hwframe+0x49/0xbe
Reported-by: Ming Lei <ming.lei@redhat.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Pull in v4.20-rc5, solving a conflict we'll otherwise get in aio.c and
also getting the merge fix that went into mainline that users are
hitting testing for-4.21/block and/or for-next.
* tag 'v4.20-rc5': (664 commits)
Linux 4.20-rc5
PCI: Fix incorrect value returned from pcie_get_speed_cap()
MAINTAINERS: Update linux-mips mailing list address
ocfs2: fix potential use after free
mm/khugepaged: fix the xas_create_range() error path
mm/khugepaged: collapse_shmem() do not crash on Compound
mm/khugepaged: collapse_shmem() without freezing new_page
mm/khugepaged: minor reorderings in collapse_shmem()
mm/khugepaged: collapse_shmem() remember to clear holes
mm/khugepaged: fix crashes due to misaccounted holes
mm/khugepaged: collapse_shmem() stop if punched or truncated
mm/huge_memory: fix lockdep complaint on 32-bit i_size_read()
mm/huge_memory: splitting set mapping+index before unfreeze
mm/huge_memory: rename freeze_page() to unmap_page()
initramfs: clean old path before creating a hardlink
kernel/kcov.c: mark funcs in __sanitizer_cov_trace_pc() as notrace
psi: make disabling/enabling easier for vendor kernels
proc: fixup map_files test on arm
debugobjects: avoid recursive calls with kmemleak
userfaultfd: shmem: UFFDIO_COPY: set the page dirty if VM_WRITE is not set
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Even if we have no waiters on any of the sbitmap_queue wait states, we
still have to loop every entry to check. We do this for every IO, so
the cost adds up.
Shift a bit of the cost to the slow path, when we actually have waiters.
Wrap prepare_to_wait_exclusive() and finish_wait(), so we can maintain
an internal count of how many are currently active. Then we can simply
check this count in sbq_wake_ptr() and not have to loop if we don't
have any sleepers.
Convert the two users of sbitmap with waiting, blk-mq-tag and iSCSI.
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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sbitmap maintains a set of words that we use to set and clear bits, with
each bit representing a tag for blk-mq. Even though we spread the bits
out and maintain a hint cache, one particular bit allocated will end up
being cleared in the exact same spot.
This introduces batched clearing of bits. Instead of clearing a given
bit, the same bit is set in a cleared/free mask instead. If we fail
allocating a bit from a given word, then we check the free mask, and
batch move those cleared bits at that time. This trades 64 atomic bitops
for 2 cmpxchg().
In a threaded poll test case, half the overhead of getting and clearing
tags is removed with this change. On another poll test case with a
single thread, performance is unchanged.
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If we aren't forced to do round robin tag allocation, just use the
allocation hint to find the index for the tag word, don't use it for the
offset inside the word. This avoids a potential extra round trip in the
bit looping, and since we're fetching this cacheline, we may as well
check the whole word from the start.
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu:
"API:
- Add 1472-byte test to tcrypt for IPsec
- Reintroduced crypto stats interface with numerous changes
- Support incremental algorithm dumps
Algorithms:
- Add xchacha12/20
- Add nhpoly1305
- Add adiantum
- Add streebog hash
- Mark cts(cbc(aes)) as FIPS allowed
Drivers:
- Improve performance of arm64/chacha20
- Improve performance of x86/chacha20
- Add NEON-accelerated nhpoly1305
- Add SSE2 accelerated nhpoly1305
- Add AVX2 accelerated nhpoly1305
- Add support for 192/256-bit keys in gcmaes AVX
- Add SG support in gcmaes AVX
- ESN for inline IPsec tx in chcr
- Add support for CryptoCell 703 in ccree
- Add support for CryptoCell 713 in ccree
- Add SM4 support in ccree
- Add SM3 support in ccree
- Add support for chacha20 in caam/qi2
- Add support for chacha20 + poly1305 in caam/jr
- Add support for chacha20 + poly1305 in caam/qi2
- Add AEAD cipher support in cavium/nitrox"
* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (130 commits)
crypto: skcipher - remove remnants of internal IV generators
crypto: cavium/nitrox - Fix build with !CONFIG_DEBUG_FS
crypto: salsa20-generic - don't unnecessarily use atomic walk
crypto: skcipher - add might_sleep() to skcipher_walk_virt()
crypto: x86/chacha - avoid sleeping under kernel_fpu_begin()
crypto: cavium/nitrox - Added AEAD cipher support
crypto: mxc-scc - fix build warnings on ARM64
crypto: api - document missing stats member
crypto: user - remove unused dump functions
crypto: chelsio - Fix wrong error counter increments
crypto: chelsio - Reset counters on cxgb4 Detach
crypto: chelsio - Handle PCI shutdown event
crypto: chelsio - cleanup:send addr as value in function argument
crypto: chelsio - Use same value for both channel in single WR
crypto: chelsio - Swap location of AAD and IV sent in WR
crypto: chelsio - remove set but not used variable 'kctx_len'
crypto: ux500 - Use proper enum in hash_set_dma_transfer
crypto: ux500 - Use proper enum in cryp_set_dma_transfer
crypto: aesni - Add scatter/gather avx stubs, and use them in C
crypto: aesni - Introduce partial block macro
..
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Now that the generic implementation of ChaCha20 has been refactored to
allow varying the number of rounds, add support for XChaCha12, which is
the XSalsa construction applied to ChaCha12. ChaCha12 is one of the
three ciphers specified by the original ChaCha paper
(https://cr.yp.to/chacha/chacha-20080128.pdf: "ChaCha, a variant of
Salsa20"), alongside ChaCha8 and ChaCha20. ChaCha12 is faster than
ChaCha20 but has a lower, but still large, security margin.
We need XChaCha12 support so that it can be used in the Adiantum
encryption mode, which enables disk/file encryption on low-end mobile
devices where AES-XTS is too slow as the CPUs lack AES instructions.
We'd prefer XChaCha20 (the more popular variant), but it's too slow on
some of our target devices, so at least in some cases we do need the
XChaCha12-based version. In more detail, the problem is that Adiantum
is still much slower than we're happy with, and encryption still has a
quite noticeable effect on the feel of low-end devices. Users and
vendors push back hard against encryption that degrades the user
experience, which always risks encryption being disabled entirely. So
we need to choose the fastest option that gives us a solid margin of
security, and here that's XChaCha12. The best known attack on ChaCha
breaks only 7 rounds and has 2^235 time complexity, so ChaCha12's
security margin is still better than AES-256's. Much has been learned
about cryptanalysis of ARX ciphers since Salsa20 was originally designed
in 2005, and it now seems we can be comfortable with a smaller number of
rounds. The eSTREAM project also suggests the 12-round version of
Salsa20 as providing the best balance among the different variants:
combining very good performance with a "comfortable margin of security".
Note that it would be trivial to add vanilla ChaCha12 in addition to
XChaCha12. However, it's unneeded for now and therefore is omitted.
As discussed in the patch that introduced XChaCha20 support, I
considered splitting the code into separate chacha-common, chacha20,
xchacha20, and xchacha12 modules, so that these algorithms could be
enabled/disabled independently. However, since nearly all the code is
shared anyway, I ultimately decided there would have been little benefit
to the added complexity.
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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In preparation for adding XChaCha12 support, rename/refactor
chacha20-generic to support different numbers of rounds. The
justification for needing XChaCha12 support is explained in more detail
in the patch "crypto: chacha - add XChaCha12 support".
The only difference between ChaCha{8,12,20} are the number of rounds
itself; all other parts of the algorithm are the same. Therefore,
remove the "20" from all definitions, structures, functions, files, etc.
that will be shared by all ChaCha versions.
Also make ->setkey() store the round count in the chacha_ctx (previously
chacha20_ctx). The generic code then passes the round count through to
chacha_block(). There will be a ->setkey() function for each explicitly
allowed round count; the encrypt/decrypt functions will be the same. I
decided not to do it the opposite way (same ->setkey() function for all
round counts, with different encrypt/decrypt functions) because that
would have required more boilerplate code in architecture-specific
implementations of ChaCha and XChaCha.
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Refactor the unkeyed permutation part of chacha20_block() into its own
function, then add hchacha20_block() which is the ChaCha equivalent of
HSalsa20 and is an intermediate step towards XChaCha20 (see
https://cr.yp.to/snuffle/xsalsa-20081128.pdf). HChaCha20 skips the
final addition of the initial state, and outputs only certain words of
the state. It should not be used for streaming directly.
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Pull networking updates from David Miller:
1) New ipset extensions for matching on destination MAC addresses, from
Stefano Brivio.
2) Add ipv4 ttl and tos, plus ipv6 flow label and hop limit offloads to
nfp driver. From Stefano Brivio.
3) Implement GRO for plain UDP sockets, from Paolo Abeni.
4) Lots of work from Michał Mirosław to eliminate the VLAN_TAG_PRESENT
bit so that we could support the entire vlan_tci value.
5) Rework the IPSEC policy lookups to better optimize more usecases,
from Florian Westphal.
6) Infrastructure changes eliminating direct manipulation of SKB lists
wherever possible, and to always use the appropriate SKB list
helpers. This work is still ongoing...
7) Lots of PHY driver and state machine improvements and
simplifications, from Heiner Kallweit.
8) Various TSO deferral refinements, from Eric Dumazet.
9) Add ntuple filter support to aquantia driver, from Dmitry Bogdanov.
10) Batch dropping of XDP packets in tuntap, from Jason Wang.
11) Lots of cleanups and improvements to the r8169 driver from Heiner
Kallweit, including support for ->xmit_more. This driver has been
getting some much needed love since he started working on it.
12) Lots of new forwarding selftests from Petr Machata.
13) Enable VXLAN learning in mlxsw driver, from Ido Schimmel.
14) Packed ring support for virtio, from Tiwei Bie.
15) Add new Aquantia AQtion USB driver, from Dmitry Bezrukov.
16) Add XDP support to dpaa2-eth driver, from Ioana Ciocoi Radulescu.
17) Implement coalescing on TCP backlog queue, from Eric Dumazet.
18) Implement carrier change in tun driver, from Nicolas Dichtel.
19) Support msg_zerocopy in UDP, from Willem de Bruijn.
20) Significantly improve garbage collection of neighbor objects when
the table has many PERMANENT entries, from David Ahern.
21) Remove egdev usage from nfp and mlx5, and remove the facility
completely from the tree as it no longer has any users. From Oz
Shlomo and others.
22) Add a NETDEV_PRE_CHANGEADDR so that drivers can veto the change and
therefore abort the operation before the commit phase (which is the
NETDEV_CHANGEADDR event). From Petr Machata.
23) Add indirect call wrappers to avoid retpoline overhead, and use them
in the GRO code paths. From Paolo Abeni.
24) Add support for netlink FDB get operations, from Roopa Prabhu.
25) Support bloom filter in mlxsw driver, from Nir Dotan.
26) Add SKB extension infrastructure. This consolidates the handling of
the auxiliary SKB data used by IPSEC and bridge netfilter, and is
designed to support the needs to MPTCP which could be integrated in
the future.
27) Lots of XDP TX optimizations in mlx5 from Tariq Toukan.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1845 commits)
net: dccp: fix kernel crash on module load
drivers/net: appletalk/cops: remove redundant if statement and mask
bnx2x: Fix NULL pointer dereference in bnx2x_del_all_vlans() on some hw
net/net_namespace: Check the return value of register_pernet_subsys()
net/netlink_compat: Fix a missing check of nla_parse_nested
ieee802154: lowpan_header_create check must check daddr
net/mlx4_core: drop useless LIST_HEAD
mlxsw: spectrum: drop useless LIST_HEAD
net/mlx5e: drop useless LIST_HEAD
iptunnel: Set tun_flags in the iptunnel_metadata_reply from src
net/mlx5e: fix semicolon.cocci warnings
staging: octeon: fix build failure with XFRM enabled
net: Revert recent Spectre-v1 patches.
can: af_can: Fix Spectre v1 vulnerability
packet: validate address length if non-zero
nfc: af_nfc: Fix Spectre v1 vulnerability
phonet: af_phonet: Fix Spectre v1 vulnerability
net: core: Fix Spectre v1 vulnerability
net: minor cleanup in skb_ext_add()
net: drop the unused helper skb_ext_get()
...
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Lots of conflicts, by happily all cases of overlapping
changes, parallel adds, things of that nature.
Thanks to Stephen Rothwell, Saeed Mahameed, and others
for their guidance in these resolutions.
Signed-off-by: David S. Miller <davem@davemloft.net>
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This is one of only two files that initialize a semaphore to a negative
value. We don't really need the two semaphores here at all, but can do
the same thing in more conventional and more effient way, by using a
single waitqueue and an atomic thread counter.
This gets us a little bit closer to eliminating classic semaphores from
the kernel. It also fixes a corner case where we fail to continue after
one of the threads fails to start up.
An alternative would be to use a split kthread_create()+wake_up_process()
and completely eliminate the separate synchronization.
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Several conflicts, seemingly all over the place.
I used Stephen Rothwell's sample resolutions for many of these, if not
just to double check my own work, so definitely the credit largely
goes to him.
The NFP conflict consisted of a bug fix (moving operations
past the rhashtable operation) while chaning the initial
argument in the function call in the moved code.
The net/dsa/master.c conflict had to do with a bug fix intermixing of
making dsa_master_set_mtu() static with the fixing of the tagging
attribute location.
cls_flower had a conflict because the dup reject fix from Or
overlapped with the addition of port range classifiction.
__set_phy_supported()'s conflict was relatively easy to resolve
because Andrew fixed it in both trees, so it was just a matter
of taking the net-next copy. Or at least I think it was :-)
Joe Stringer's fix to the handling of netns id 0 in bpf_sk_lookup()
intermixed with changes on how the sdif and caller_net are calculated
in these code paths in net-next.
The remaining BPF conflicts were largely about the addition of the
__bpf_md_ptr stuff in 'net' overlapping with adjustments and additions
to the relevant data structure where the MD pointer macros are used.
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next
Kalle Valo says:
====================
wireless-drivers-next patches for 4.21
First set of patches for 4.21. Most notable here is support for
Quantenna's QSR1000/QSR2000 chipsets and more flexible ways to provide
nvram files for brcmfmac.
Major changes:
brcmfmac
* add support for first trying to get a board specific nvram file
* add support for getting nvram contents from EFI variables
qtnfmac
* use single PCIe driver for all platforms and rename
Kconfig option CONFIG_QTNFMAC_PEARL_PCIE to CONFIG_QTNFMAC_PCIE
* add support for QSR1000/QSR2000 (Topaz) family of chipsets
ath10k
* add support for WCN3990 firmware crash recovery
* add firmware memory dump support for QCA4019
wil6210
* add firmware error recovery while in AP mode
ath9k
* remove experimental notice from dynack feature
iwlwifi
* PCI IDs for some new 9000-series cards
* improve antenna usage on connection problems
* new firmware debugging infrastructure
* some more work on 802.11ax
* improve support for multiple RF modules with 22000 devices
cordic
* move cordic macros and defines to a public header file
* convert brcmsmac and b43 to fully use cordic library
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Now that these macros are in header file, we can eventually
clean up the duplicate macros present in the drivers that
utilize the same cordic algorithm implementation.
Also add CORDIC_ prefix to nonprefixed macros.
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Priit Laes <plaes@plaes.org>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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invalidated a lookup
Some users of rhashtables might need to move an object from one table
to another - this appears to be the reason for the incomplete usage
of NULLS markers.
To support these, we store a unique NULLS_MARKER at the end of
each chain, and when a search fails to find a match, we check
if the NULLS marker found was the expected one. If not, the search
may not have examined all objects in the target bucket, so it is
repeated.
The unique NULLS_MARKER is derived from the address of the
head of the chain. As this cannot be derived at load-time the
static rhnull in rht_bucket_nested() needs to be initialised
at run time.
Any caller of a lookup function must still be prepared for the
possibility that the object returned is in a different table - it
might have been there for some time.
Note that this does NOT provide support for other uses of
NULLS_MARKERs such as allocating with SLAB_TYPESAFE_BY_RCU or changing
the key of an object and re-inserting it in the same table.
These could only be done safely if new objects were inserted
at the *start* of a hash chain, and that is not currently the case.
Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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