* [tip: core/rcu] arm: Use common outgoing-CPU-notification code
@ 2019-08-23 3:34 tip-bot2 for Paul E. McKenney
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From: tip-bot2 for Paul E. McKenney @ 2019-08-23 3:34 UTC (permalink / raw)
To: linux-tip-commits
Cc: Mark Rutland, Russell King, linux-kernel, Paul E. McKenney,
Dietmar Eggemann, linux-arm-kernel
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 1d5087ab964d84e5a0cfe5059cf5e929127d573f
Gitweb: https://git.kernel.org/tip/1d5087ab964d84e5a0cfe5059cf5e929127d573f
Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
AuthorDate: Tue, 12 May 2015 14:50:06 -07:00
Committer: Paul E. McKenney <paulmck@linux.ibm.com>
CommitterDate: Mon, 12 Aug 2019 11:25:06 -07:00
arm: 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
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
---
arch/arm/kernel/smp.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index aab8ba4..4b0bab2 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -264,15 +264,13 @@ 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;
}
@@ -319,7 +317,7 @@ 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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