Messages in this thread Patch in this message | | | Date | Tue, 11 Jun 2019 12:24:10 -0700 | From | "Paul E. McKenney" <> | Subject | [PATCH 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> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index ebc53804d57b..8687d619260f 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -267,15 +267,13 @@ int __cpu_disable(void) return 0; } -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_err("CPU%u: cpu didn't die\n", cpu); return; } @@ -322,7 +320,7 @@ void arch_cpu_idle_dead(void) * this returns, power and/or clocks can be removed at any point * 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
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