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arm: Use common outgoing-CPU-notification code

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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
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
This commit is contained in:
Paul E. McKenney 2015-05-12 14:50:06 -07:00 • committed by Paul E. McKenney
parent b823cafa75
commit 1d5087ab96
1 changed files with 2 additions and 4 deletions
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6
arch/arm/kernel/smp.c
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@ -264,15 +264,13 @@ int __cpu_disable(void)
return 0; return 0;
} }
static DECLARE_COMPLETION(cpu_died);
/* /*
* called on the thread which is asking for a CPU to be shutdown - * called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out. * waits until shutdown has completed, or it is timed out.
*/ */
void __cpu_die(unsigned int cpu) void __cpu_die(unsigned int cpu)
{ {
if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) { if (!cpu_wait_death(cpu, 5)) {
pr_err("CPU%u: cpu didn't die\n", cpu); pr_err("CPU%u: cpu didn't die\n", cpu);
return; return;
} }
@ -319,7 +317,7 @@ void arch_cpu_idle_dead(void)
* this returns, power and/or clocks can be removed at any point * this returns, power and/or clocks can be removed at any point
* from this CPU and its cache by platform_cpu_kill(). * from this CPU and its cache by platform_cpu_kill().
*/ */
complete(&cpu_died); (void)cpu_report_death();
/* /*
* Ensure that the cache lines associated with that completion are * Ensure that the cache lines associated with that completion are