linux-kernel - [tip:perf/core] perf/core: Remove bogus UP

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Date:	Wed, 17 Feb 2016 04:24:10 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...hat.com, linux-kernel@...r.kernel.org, mingo@...nel.org,
	peterz@...radead.org, tglx@...utronix.de, vincent.weaver@...ne.edu,
	eranian@...gle.com, hpa@...or.com, torvalds@...ux-foundation.org,
	acme@...hat.com
Subject: [tip:perf/core] perf/core: Remove bogus UP_CANCELED hotplug state

Commit-ID:  b4f75d44bed1bdbb14ac704bfc38f62a3675e591
Gitweb:     http://git.kernel.org/tip/b4f75d44bed1bdbb14ac704bfc38f62a3675e591
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 9 Feb 2016 20:11:20 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 17 Feb 2016 10:37:28 +0100

perf/core: Remove bogus UP_CANCELED hotplug state

If CPU_UP_PREPARE fails the perf hotplug code calls perf_event_exit_cpu(),
which is a pointless exercise. The cpu is not online, so the smp function
calls return -ENXIO. So the result is a list walk to call noops.

Remove it.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/20160209201007.682184765@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5946460..474ffea 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9286,7 +9286,6 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
 		perf_event_init_cpu(cpu);
 		break;
 
-	case CPU_UP_CANCELED:
 	case CPU_DOWN_PREPARE:
 		perf_event_exit_cpu(cpu);
 		break;