linux-kernel - [tip:perf/core] perf/x86: Fix Userspace RDPMC switch

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Message-ID: <tip-69efsat90ibhnd577zy3z9gh@git.kernel.org>
Date:	Mon, 10 Feb 2014 05:28:32 -0800
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, junk@...af.co.uk, tglx@...utronix.de
Subject: [tip:perf/core] perf/x86: Fix Userspace RDPMC switch

Commit-ID:  0e9f2204cfa6d79abe3e525ddf7c4ab5792cc751
Gitweb:     http://git.kernel.org/tip/0e9f2204cfa6d79abe3e525ddf7c4ab5792cc751
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 5 Feb 2014 11:19:56 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 9 Feb 2014 13:08:25 +0100

perf/x86: Fix Userspace RDPMC switch

The current code forgets to change the CR4 state on the current CPU.
Use on_each_cpu() instead of smp_call_function().

Reported-by: Mark Davies <junk@...af.co.uk>
Suggested-by: Mark Davies <junk@...af.co.uk>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: fweisbec@...il.com
Link: http://lkml.kernel.org/n/tip-69efsat90ibhnd577zy3z9gh@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 1246b85..895604f 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1826,7 +1826,7 @@ static ssize_t set_attr_rdpmc(struct device *cdev,
 
 	if (!!val != !!x86_pmu.attr_rdpmc) {
 		x86_pmu.attr_rdpmc = !!val;
-		smp_call_function(change_rdpmc, (void *)val, 1);
+		on_each_cpu(change_rdpmc, (void *)val, 1);
 	}
 
 	return count;
--
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