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s390/smp: Handle restart interrupt on ipl cpu

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The current smp code allows to trigger a restart interrupt on CPUs
offline in linux. To allow using the percpu infrastructure instead
of the pcpu_devices array, switch to the ipl cpu which is always
online before calling do_restart().

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-07-16 09:26:13 +02:00 committed by Vasily Gorbik
parent b798b685b4
commit a795eeaf85
3 changed files with 1 additions and 17 deletions
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1
arch/s390/include/asm/smp.h
View File

@ -24,7 +24,6 @@ extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
extern void arch_send_call_function_single_ipi(int cpu);
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);

2
arch/s390/kernel/ipl.c
View File

@ -2112,7 +2112,7 @@ void do_restart(void *arg)
tracing_off();
debug_locks_off();
lgr_info_log();
smp_call_online_cpu(__do_restart, arg);
smp_call_ipl_cpu(__do_restart, arg);
}
/* on halt */

15
arch/s390/kernel/smp.c
View File

@ -382,21 +382,6 @@ static int pcpu_set_smt(unsigned int mtid)
return cc;
}
/*
* Call function on an online CPU.
*/
void smp_call_online_cpu(void (*func)(void *), void *data)
{
struct pcpu *pcpu;
/* Use the current cpu if it is online. */
pcpu = pcpu_find_address(cpu_online_mask, stap());
if (!pcpu)
/* Use the first online cpu. */
pcpu = pcpu_devices + cpumask_first(cpu_online_mask);
pcpu_delegate(pcpu, func, data, (unsigned long) restart_stack);
}
/*
* Call function on the ipl CPU.
*/