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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-10-29 10:28:26 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-11-27 09:24:14 +0100 |
| commit | 1a36a39e225d3558fb3776a3d3d7736cf1ec9f60 (patch) | |
| tree | 63a1c8892ff95dac939beb6e7a13456fcec20cb7 /arch/s390/kernel/setup.c | |
| parent | f08b8414632c9f256e33f0a18104d8d5e103d204 (diff) | |
| download | linux-1a36a39e225d3558fb3776a3d3d7736cf1ec9f60.tar.gz linux-1a36a39e225d3558fb3776a3d3d7736cf1ec9f60.tar.xz | |
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/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 8f5107d6ebb3..22756bb0819e 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -865,11 +865,13 @@ void __init setup_arch(char **cmdline_p) check_initrd(); reserve_crashkernel(); +#ifdef CONFIG_CRASH_DUMP /* * Be aware that smp_save_dump_cpus() triggers a system reset. * Therefore CPU and device initialization should be done afterwards. */ smp_save_dump_cpus(); +#endif setup_resources(); setup_vmcoreinfo(); |