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author | Martin Schwidefsky | 2015-10-29 10:28:26 +0100 |
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committer | Martin Schwidefsky | 2015-11-27 09:24:14 +0100 |
commit | 1a36a39e225d3558fb3776a3d3d7736cf1ec9f60 (patch) | |
tree | 63a1c8892ff95dac939beb6e7a13456fcec20cb7 /arch/s390/kernel/ipl.c | |
parent | s390/dump: remove SAVE_AREA_BASE (diff) | |
download | kernel-qcow2-linux-1a36a39e225d3558fb3776a3d3d7736cf1ec9f60.tar.gz kernel-qcow2-linux-1a36a39e225d3558fb3776a3d3d7736cf1ec9f60.tar.xz kernel-qcow2-linux-1a36a39e225d3558fb3776a3d3d7736cf1ec9f60.zip |
s390/dump: rework CPU register dump code
To collect the CPU registers of the crashed system allocated a single
page with memblock_alloc_base and use it as a copy buffer. Replace the
stop-and-store-status sigp with a store-status-at-address sigp in
smp_save_dump_cpus() and smp_store_status(). In both cases the target
CPU is already stopped and store-status-at-address avoids the detour
via the absolute zero page.
For kexec simplify s390_reset_system and call store_status() before
the prefix register of the boot CPU has been set to zero. Use STPX
to store the prefix register and remove dump_prefix_page.
Acked-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/ipl.c')
-rw-r--r-- | arch/s390/kernel/ipl.c | 17 |
1 files changed, 1 insertions, 16 deletions
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index b1f0a90f933b..26d58cf72573 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -2039,10 +2039,7 @@ static void do_reset_calls(void) reset->fn(); } -u32 dump_prefix_page; - -void s390_reset_system(void (*fn_pre)(void), - void (*fn_post)(void *), void *data) +void s390_reset_system(void) { struct _lowcore *lc; @@ -2051,9 +2048,6 @@ void s390_reset_system(void (*fn_pre)(void), /* Stack for interrupt/machine check handler */ lc->panic_stack = S390_lowcore.panic_stack; - /* Save prefix page address for dump case */ - dump_prefix_page = (u32)(unsigned long) lc; - /* Disable prefixing */ set_prefix(0); @@ -2077,14 +2071,5 @@ void s390_reset_system(void (*fn_pre)(void), S390_lowcore.subchannel_id = 0; S390_lowcore.subchannel_nr = 0; - /* Store status at absolute zero */ - store_status(); - - /* Call function before reset */ - if (fn_pre) - fn_pre(); do_reset_calls(); - /* Call function after reset */ - if (fn_post) - fn_post(data); } |