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[S390] Force PSW restart on online CPU

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PSW restart can be triggered on offline CPUs. If this happens, currently
the PSW restart code fails, because functions like smp_processor_id()
do not work on offline CPUs. This patch fixes this as follows:

If PSW restart is triggered on an offline CPU, the PSW restart (sigp restart)
is done a second time on another CPU that is online and the old CPU is
stopped afterwards.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
2011-10-30 15:16:38 +01:00
committed by Martin Schwidefsky
parent d3bf37955d
commit 1943f53c9c
3 changed files with 29 additions and 0 deletions
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5
arch/s390/include/asm/smp.h
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@@ -33,6 +33,7 @@ extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
int from, int to);
extern void smp_restart_with_online_cpu(void);
extern void smp_restart_cpu(void);
/*
@@ -64,6 +65,10 @@ static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
func(data);
}
static inline void smp_restart_with_online_cpu(void)
{
}
#define smp_vcpu_scheduled (1)
#endif /* CONFIG_SMP */