diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-09-15 16:24:31 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-19 17:07:32 +0200 |
| commit | 00a8f886dbdaeea1d93543d5311ddf3a2680bf2b (patch) | |
| tree | ff90be560ccfb78b9bd1a165dd552c0ee5263dda /arch/s390/include/asm/smp.h | |
| parent | 608796ffe13855bb066bebbd58d8b86a49cb5c27 (diff) | |
s390/nmi: use smp_emergency_stop instead of smp_send_stop
The smp_send_stop() function can be called from s390_handle_damage
while DAT is off. This happens if a machine check indicates that
kernel gprs or control registers can not be restored. The function
smp_send_stop reenables DAT via __load_psw_mask. That should work
for the case of lost kernel gprs and the system will do the expected
stop of all CPUs. But if control registers are lost, in particular
CR13 with the home space ASCE, interesting secondary crashes may
occur.
Make smp_emergency_stop callable from nmi.c and remove the cpumask
argument. Replace the smp_send_stop call with smp_emergency_stop in
the s390_handle_damage function.
In addition add notrace and NOKPROBE_SYMBOL annotations for all
functions required for the emergency shutdown.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/smp.h')
| -rw-r--r-- | arch/s390/include/asm/smp.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 3deb134587b7..3470274a985c 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -27,6 +27,7 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); extern void smp_call_online_cpu(void (*func)(void *), void *); extern void smp_call_ipl_cpu(void (*func)(void *), void *); +extern void smp_emergency_stop(void); extern int smp_find_processor_id(u16 address); extern int smp_store_status(int cpu); @@ -52,6 +53,10 @@ static inline void smp_call_online_cpu(void (*func)(void *), void *data) func(data); } +static inline void smp_emergency_stop(void) +{ +} + static inline int smp_find_processor_id(u16 address) { return 0; } static inline int smp_store_status(int cpu) { return 0; } static inline int smp_vcpu_scheduled(int cpu) { return 1; } |