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* cgroups: add per-thread subsystem callbacksBen Blum2011-05-279-142/+114Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add cgroup subsystem callbacks for per-thread attachment in atomic contexts Add can_attach_task(), pre_attach(), and attach_task() as new callbacks for cgroups's subsystem interface. Unlike can_attach and attach, these are for per-thread operations, to be called potentially many times when attaching an entire threadgroup. Also, the old "bool threadgroup" interface is removed, as replaced by this. All subsystems are modified for the new interface - of note is cpuset, which requires from/to nodemasks for attach to be globally scoped (though per-cpuset would work too) to persist from its pre_attach to attach_task and attach. This is a pre-patch for cgroup-procs-writable.patch. Signed-off-by: Ben Blum <bblum@andrew.cmu.edu> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Matt Helsley <matthltc@us.ibm.com> Reviewed-by: Paul Menage <menage@google.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* cgroups: read-write lock CLONE_THREAD forking per threadgroupBen Blum2011-05-273-0/+55
| | | | | | | | | | | | | | | | | | | | | | | Adds functionality to read/write lock CLONE_THREAD fork()ing per-threadgroup Add an rwsem that lives in a threadgroup's signal_struct that's taken for reading in the fork path, under CONFIG_CGROUPS. If another part of the kernel later wants to use such a locking mechanism, the CONFIG_CGROUPS ifdefs should be changed to a higher-up flag that CGROUPS and the other system would both depend on. This is a pre-patch for cgroup-procs-write.patch. Signed-off-by: Ben Blum <bblum@andrew.cmu.edu> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Matt Helsley <matthltc@us.ibm.com> Reviewed-by: Paul Menage <menage@google.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Documentation: configfs examples crash fixJiri Slaby2011-05-272-8/+4Star
| | | | | | | | | | | | When configfs_register_subsystem() fails, we unregister too many subsystems in configfs_example_init. Decrement i by one to not unregister non-registered subsystem. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Joel Becker <joel.becker@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* getdelays: show average CPU/IO/SWAP/RECLAIM delaysWu Fengguang2011-05-271-13/+20
| | | | | | | | | | | | | | | | | | | | | | | | I find it very handy to show the average delays in milliseconds. Example output (on 100 concurrent dd reading sparse files): CPU count real total virtual total delay total delay average 986 3223509952 3207643301 38863410579 39.415ms IO count delay total delay average 0 0 0ms SWAP count delay total delay average 0 0 0ms RECLAIM count delay total delay average 1059 5131834899 4ms dd: read=0, write=0, cancelled_write=0 Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Mel Gorman <mel@linux.vnet.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Reviewed-by: Satoru Moriya <satoru.moriya@hds.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Documentation/accounting/getdelays.c: handle sendto() failuresAndrew Morton2011-05-271-0/+2
| | | | | | | | | | | | Fixes Documentation/accounting/getdelays.c: In function `get_family_id': Documentation/accounting/getdelays.c:172:14: warning: variable `rc' set but not used [-Wunused-but-set-variable] Reported-by: "Justin P. Mattock" <justinmattock@gmail.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Documentation/accounting/getdelays.c: fix unused var warningJustin P. Mattock2011-05-271-3/+0Star
| | | | | | | | | | | | Fixes Documentation/accounting/getdelays.c: In function `main': Documentation/accounting/getdelays.c:436:7: warning: variable `i' set but not used [-Wunused-but-set-variable] Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Documentation/atomic_ops.txt: avoid volatile in sample codeNikanth Karthikesan2011-05-271-1/+1
| | | | | | | | | As declaring counter as volatile is discouraged, it is best not to use it in sample code as well. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ufs: fix truncated values handling 64 bit metadataDan Carpenter2011-05-272-5/+6
| | | | | | | | | | | | | Originally i_lastfrag was 32 bits but then we added support for handling 64 bit metadata and it became a 64 bit variable. That was during 2007, in 54fb996ac15c "[PATCH] ufs2 write: block allocation update". Unfortunately these casts got left behind so the value got truncated to 32 bit again. [akpm@linux-foundation.org: remove now-unneeded min_t/max_t casting] Signed-off-by: Dan Carpenter <error27@gmail.com> Cc: Evgeniy Dushistov <dushistov@mail.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/rtc/rtc-mxc.c: remove defines already included in rtc.hWolfram Sang2011-05-272-10/+4Star
| | | | | | | | | [akpm@linux-foundation.org: retain the code comments] Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Cc: Vladimir Zapolskiy <vzapolskiy@gmail.com> Cc: Alessandro Zummo <alessandro.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/rtc/rtc-pcf50633.c: don't request update IRQLars-Peter Clausen2011-05-271-20/+3Star
| | | | | | | | | | | | | | Commit 51ba60c5 ("RTC: Cleanup rtc_class_ops->update_irq_enable()") removed the only user of the update IRQ, so there is no need to manage it any more. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br> Cc: John Stultz <john.stultz@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rtc: add support for spear rtcRajeev Kumar2011-05-273-0/+543
| | | | | | | | Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com> Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/rtc/rtc-mrst.c: use release_mem_region after request_mem_regionJulia Lawall2011-05-271-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | The memory allocated using request_mem_region should be released using release_mem_region, not release_region. The semantic patch that fixes part of this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression E1,E2,E3; @@ request_mem_region(E1,E2,E3) ... ?- release_region(E1,E2) + release_mem_region(E1,E2) // </smpl> [akpm@linux-foundation.org: use resource_size()] Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rtc: add basic support for ST M41T93 SPI RTCVoss, Nikolaus2011-05-273-0/+235
| | | | | | | | | | | Add basic support for ST m41t93 SPI RTCs. Tested with factory-new and with "run-in" species with and without backup batteries. Signed-off-by: Nikolaus Voss <n.voss@weinmann.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rtc: add rv3029c2 RTC supportHeiko Schocher2011-05-273-0/+464
| | | | | | | | | | | | Add support for the Micro Crystal RV3029-C2 RTC chips. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Gregory Hermant <gregory.hermant@calao-systems.com> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rtc: add EM3027 rtc driverMike Rapoport2011-05-273-0/+171
| | | | | | | | | Add support for EM Microelectronic EM3027 RTC chip. Signed-off-by: Mike Rapoport <mike@compulab.co.il> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rtc: add support for the RTC in VIA VT8500 and compatiblesAlexey Charkov2011-05-273-0/+374
| | | | | | | | | | | | | This adds a driver for the RTC devices in VIA and WonderMedia Systems-on-Chip. Alarm, 1Hz interrupts, reading and setting time are supported. Signed-off-by: Alexey Charkov <alchark@gmail.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: Alexey Charkov <alchark@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* flex_array: avoid divisions when accessing elementsJesse Gross2011-05-272-22/+31
| | | | | | | | | | | | | | | | | | On most architectures division is an expensive operation and accessing an element currently requires four of them. This performance penalty effectively precludes flex arrays from being used on any kind of fast path. However, two of these divisions can be handled at creation time and the others can be replaced by a reciprocal divide, completely avoiding real divisions on access. [eparis@redhat.com: rebase on top of changes to support 0 len elements] [eparis@redhat.com: initialize part_nr when array fits entirely in base] Signed-off-by: Jesse Gross <jesse@nicira.com> Signed-off-by: Eric Paris <eparis@redhat.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* m32r: remove redundant declarationKOSAKI Motohiro2011-05-271-11/+2Star
| | | | | | | | | They have no meaning. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* m32r: fix spin_lock_irqsave() misuseKOSAKI Motohiro2011-05-271-1/+2
| | | | | | | | | spin_lock_irqsave() requires unsigned long. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* m32r: convert cpumask apiKOSAKI Motohiro2011-05-273-52/+51Star
| | | | | | | | | | | | | We plan to remove cpus_xx() old cpumask APIs later. Also, we plan to change mm_cpu_mask() implementation, allocate only nr_cpu_ids, thus *mm_cpu_mask() is dangerous operation. Then, this patch convert them. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/bcma/host_pci.c needs slab.hAndrew Morton2011-05-271-0/+1
| | | | | | | | | | | | | alpha allmodconfig: drivers/bcma/host_pci.c: In function 'bcma_host_pci_probe': drivers/bcma/host_pci.c:102: error: implicit declaration of function 'kzalloc' drivers/bcma/host_pci.c:102: warning: assignment makes pointer from integer without a cast Cc: <zajec5@gmail.com> Cc: John W. Linville <linville@tuxdriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/video/mb862xx/mb862xxfbdrv.c needs uaccess.hAndrew Morton2011-05-271-0/+1
| | | | | | | | | | | | | alpha allmodconfig: drivers/video/mb862xx/mb862xxfbdrv.c: In function 'mb862xxfb_ioctl': drivers/video/mb862xx/mb862xxfbdrv.c:323: error: implicit declaration of function 'copy_to_user' drivers/video/mb862xx/mb862xxfbdrv.c:327: error: implicit declaration of function 'copy_from_user' Cc: Paul Mundt <lethal@linux-sh.org> Cc: Anatolij Gustschin <agust@denx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Set cred->user_ns in key_replace_session_keyringSerge E. Hallyn2011-05-261-0/+1
| | | | | | | | | | | | | | Since this cred was not created with copy_creds(), it needs to get initialized. Otherwise use of syscall(__NR_keyctl, KEYCTL_SESSION_TO_PARENT); can lead to a NULL deref. Thanks to Robert for finding this. But introduced by commit 47a150edc2a ("Cache user_ns in struct cred"). Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com> Reported-by: Robert Święcki <robert@swiecki.net> Cc: David Howells <dhowells@redhat.com> Cc: stable@kernel.org (2.6.39) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'trivial' of ↵Linus Torvalds2011-05-2640-54/+44Star
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 * 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6: gfs2: Drop __TIME__ usage isdn/diva: Drop __TIME__ usage atm: Drop __TIME__ usage dlm: Drop __TIME__ usage wan/pc300: Drop __TIME__ usage parport: Drop __TIME__ usage hdlcdrv: Drop __TIME__ usage baycom: Drop __TIME__ usage pmcraid: Drop __DATE__ usage edac: Drop __DATE__ usage rio: Drop __DATE__ usage scsi/wd33c93: Drop __TIME__ usage scsi/in2000: Drop __TIME__ usage aacraid: Drop __TIME__ usage media/cx231xx: Drop __TIME__ usage media/radio-maxiradio: Drop __TIME__ usage nozomi: Drop __TIME__ usage cyclades: Drop __TIME__ usage
| * gfs2: Drop __TIME__ usageMichal Marek2011-05-261-1/+1
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: cluster-devel@redhat.com Signed-off-by: Michal Marek <mmarek@suse.cz>
| * isdn/diva: Drop __TIME__ usageMichal Marek2011-05-261-3/+2Star
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: Armin Schindler <mac@melware.de> Cc: netdev@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * atm: Drop __TIME__ usageMichal Marek2011-05-262-2/+2
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: David S. Miller <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * dlm: Drop __TIME__ usageMichal Marek2011-05-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: Christine Caulfield <ccaulfie@redhat.com> Cc: David Teigland <teigland@redhat.com> Cc: cluster-devel@redhat.com Signed-off-by: Michal Marek <mmarek@suse.cz>
| * wan/pc300: Drop __TIME__ usageMichal Marek2011-05-261-2/+1Star
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: David S. Miller <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * parport: Drop __TIME__ usageMichal Marek2011-05-251-1/+0Star
| | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Arnaud Giersch <arnaud.giersch@free.fr> Signed-off-by: Michal Marek <mmarek@suse.cz>
| * hdlcdrv: Drop __TIME__ usageMichal Marek2011-05-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Thomas Sailer <t.sailer@alumni.ethz.ch> Cc: linux-hams@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * baycom: Drop __TIME__ usageMichal Marek2011-05-254-4/+4
| | | | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Thomas Sailer <t.sailer@alumni.ethz.ch> Cc: linux-hams@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * pmcraid: Drop __DATE__ usageMichal Marek2011-04-192-6/+4Star
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: Anil Ravindranath <anil_ravindranath@pmc-sierra.com> Cc: linux-scsi@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * edac: Drop __DATE__ usageMichal Marek2011-04-1918-18/+18
| | | | | | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: Doug Thompson <dougthompson@xmission.com> Cc: bluesmoke-devel@lists.sourceforge.net Cc: linux-edac@vger.kernel.org Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
| * rio: Drop __DATE__ usageMichal Marek2011-04-191-1/+1
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. As the buildDate field is part of the userspace API, I replaced it with the date of the last code change. Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Michal Marek <mmarek@suse.cz>
| * scsi/wd33c93: Drop __TIME__ usageMichal Marek2011-04-191-4/+3Star
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: "James E.J. Bottomley" <James.Bottomley@suse.de> Cc: linux-scsi@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * scsi/in2000: Drop __TIME__ usageMichal Marek2011-04-191-1/+1
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: "James E.J. Bottomley" <James.Bottomley@suse.de> Cc: linux-scsi@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * aacraid: Drop __TIME__ usageMichal Marek2011-04-191-2/+1Star
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Cc: Adaptec OEM Raid Solutions <aacraid@adaptec.com> Cc: linux-scsi@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * media/cx231xx: Drop __TIME__ usageMichal Marek2011-04-191-1/+1
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: linux-media@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * media/radio-maxiradio: Drop __TIME__ usageMichal Marek2011-04-191-2/+1Star
| | | | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: linux-media@vger.kernel.org Signed-off-by: Michal Marek <mmarek@suse.cz>
| * nozomi: Drop __TIME__ usageMichal Marek2011-04-191-2/+1Star
| | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Michal Marek <mmarek@suse.cz>
| * cyclades: Drop __TIME__ usageMichal Marek2011-04-191-2/+1Star
| | | | | | | | | | | | | | | | | | The kernel already prints its build timestamp during boot, no need to repeat it in random drivers and produce different object files each time. Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Michal Marek <mmarek@suse.cz>
* | Merge branch 'x86-vdso-for-linus' of ↵Linus Torvalds2011-05-2618-185/+202
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: vdso: Remove unused variable x86-64: Optimize vDSO time() x86-64: Add time to vDSO x86-64: Turn off -pg and turn on -foptimize-sibling-calls for vDSO x86-64: Move vread_tsc into a new file with sensible options x86-64: Vclock_gettime(CLOCK_MONOTONIC) can't ever see nsec < 0 x86-64: Don't generate cmov in vread_tsc x86-64: Remove unnecessary barrier in vread_tsc x86-64: Clean up vdso/kernel shared variables
| * | x86: vdso: Remove unused variableThomas Gleixner2011-05-261-1/+1
| | | | | | | | | | | | | | | | | | Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@mit.edu>
| * | x86-64: Optimize vDSO time()Andy Lutomirski2011-05-241-6/+2Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This function just reads a 64-bit variable that's updated atomically, so we don't need any locks. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3C40e2700f8cda4d511e5910be1e633025d28b36c2.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | x86-64: Add time to vDSOAndy Lutomirski2011-05-242-1/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only fast implementation of time(2) we expose is through the vsyscall page and we want to get userspace to stop using the vsyscall page. So make it available through the vDSO as well. This is essentially a cut-n-paste job. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3Cbf963bac5207de4b29613f27c42705e4371812a8.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | x86-64: Turn off -pg and turn on -foptimize-sibling-calls for vDSOAndy Lutomirski2011-05-241-1/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The vDSO isn't part of the kernel, so profiling and kernel backtraces don't really matter. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3C23087b738c037342abb53f2f07b9bef89ceaeea3.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | x86-64: Move vread_tsc into a new file with sensible optionsAndy Lutomirski2011-05-244-37/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | vread_tsc is short and hot, and it's userspace code so the usual reasons to enable -pg and turn off sibling calls don't apply. (OK, turning off sibling calls has no effect. But it might someday...) As an added benefit, tsc.c is profilable now. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3C99c6d7f5efa3ccb65b4ac6eb443e1ab7bad47d7b.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | x86-64: Vclock_gettime(CLOCK_MONOTONIC) can't ever see nsec < 0Andy Lutomirski2011-05-241-18/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | vclock_gettime's do_monotonic helper can't ever generate a negative nsec value, so it doesn't need to check whether it's negative. In the CLOCK_MONOTONIC_COARSE case, ns can't ever exceed 2e9-1, so we can avoid the loop entirely. This saves a single easily-predicted branch. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3Cd6d528d32c7a21618057cfc9005942a0fe5cb54a.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | x86-64: Don't generate cmov in vread_tscAndy Lutomirski2011-05-241-2/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | vread_tsc checks whether rdtsc returns something less than cycle_last, which is an extremely predictable branch. GCC likes to generate a cmov anyway, which is several cycles slower than a predicted branch. This saves a couple of nanoseconds. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3C561280649519de41352fcb620684dfb22bad6bac.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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