From 1a36a39e225d3558fb3776a3d3d7736cf1ec9f60 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Thu, 29 Oct 2015 10:28:26 +0100 Subject: 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 Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/ipl.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'arch/s390/include/asm/ipl.h') diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h index 86634e71b69f..1dc55db8cd81 100644 --- a/arch/s390/include/asm/ipl.h +++ b/arch/s390/include/asm/ipl.h @@ -87,7 +87,6 @@ struct ipl_parameter_block { * IPL validity flags */ extern u32 ipl_flags; -extern u32 dump_prefix_page; struct dump_save_areas { struct save_area_ext **areas; @@ -176,7 +175,7 @@ enum diag308_rc { extern int diag308(unsigned long subcode, void *addr); extern void diag308_reset(void); -extern void store_status(void); +extern void store_status(void (*fn)(void *), void *data); extern void lgr_info_log(void); #endif /* _ASM_S390_IPL_H */ -- cgit v1.2.3-59-g8ed1b