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ARM: SMP: ensure smp_send_stop() waits for CPUs to stop 

Wait for CPUs to indicate that they've stopped, after sending the
stop IPI, rather than blindly continuing on and hoping that they've
stopped in time.  Print a warning if we fail to stop the other CPUs.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-02 09:53:54 +00:00
parent 0eb0511d17
commit 28e18293cf
1 changed files with 15 additions and 3 deletions
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18
arch/arm/kernel/smp.c
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@ -575,10 +575,22 @@ void smp_send_reschedule(int cpu)
void smp_send_stop(void)
{
cpumask_t mask = cpu_online_map;
cpu_clear(smp_processor_id(), mask);
if (!cpus_empty(mask))
unsigned long timeout;
if (num_online_cpus() > 1) {
cpumask_t mask = cpu_online_map;
cpu_clear(smp_processor_id(), mask);
smp_cross_call(&mask, IPI_CPU_STOP);
}
/* Wait up to one second for other CPUs to stop */
timeout = USEC_PER_SEC;
while (num_online_cpus() > 1 && timeout--)
udelay(1);
if (num_online_cpus() > 1)
pr_warning("SMP: failed to stop secondary CPUs\n");
}
/*