Commit 0e9f2204 authored Feb 05, 2014 by Peter Zijlstra Committed by Ingo Molnar Feb 09, 2014

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@eslaf.co.uk>
Suggested-by: Mark Davies <junk@eslaf.co.uk>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: fweisbec@gmail.com
Link: http://lkml.kernel.org/n/tip-69efsat90ibhnd577zy3z9gh@git.kernel.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent e97df763

arch/x86/kernel/cpu/perf_event.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;