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platform_kernel-5.15
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arm64: Use common outgoing-CPU-notification code 

This commit removes the open-coded CPU-offline notification with new
common code.  In particular, this change avoids calling scheduler code
using RCU from an offline CPU that RCU is ignoring.  This is a minimal
change.  A more intrusive change might invoke the cpu_check_up_prepare()
and cpu_set_state_online() functions at CPU-online time, which would
allow onlining throw an error if the CPU did not go offline properly.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Paul E. McKenney 2015-05-12 14:50:05 -07:00 committed by Catalin Marinas
parent 5b09a094f2
commit 05981277a4
1 changed files with 2 additions and 4 deletions
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6
arch/arm64/kernel/smp.c
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@ -254,15 +254,13 @@ static int op_cpu_kill(unsigned int cpu)
return cpu_ops[cpu]->cpu_kill(cpu);
}
static DECLARE_COMPLETION(cpu_died);
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpu_die(unsigned int cpu)
{
if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
if (!cpu_wait_death(cpu, 5)) {
pr_crit("CPU%u: cpu didn't die\n", cpu);
return;
}
@ -295,7 +293,7 @@ void cpu_die(void)
local_irq_disable();
/* Tell __cpu_die() that this CPU is now safe to dispose of */
complete(&cpu_died);
(void)cpu_report_death();
/*
* Actually shutdown the CPU. This must never fail. The specific hotplug