From: Paul E. McKenney Date: Tue, 12 May 2015 21:50:05 +0000 (-0700) Subject: arm64: Use common outgoing-CPU-notification code X-Git-Tag: firefly_0821_release~176^2~1475^2~38 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=05981277a4de1ad631a4b2c39c4fbc1db69b6f23;p=firefly-linux-kernel-4.4.55.git 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 Cc: linux-arm-kernel@lists.infradead.org Acked-by: Will Deacon Signed-off-by: Catalin Marinas --- diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index b698208848e9..65f1a7f72697 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -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