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perf_counter: more barrier in blank weak function

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Impact: fix panic possible panic

Some versions of GCC inline the weak global function if it's empty.
Add a barrier() to work it around.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-12-26 21:05:06 -08:00 committed by Ingo Molnar
parent e44aef58ec
commit 01ea1ccaa2
1 changed files with 2 additions and 2 deletions
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4
kernel/perf_counter.c
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@ -45,8 +45,8 @@ hw_perf_counter_init(struct perf_counter *counter)
}
u64 __weak hw_perf_save_disable(void) { return 0; }
void __weak hw_perf_restore(u64 ctrl) { }
void __weak hw_perf_counter_setup(void) { }
void __weak hw_perf_restore(u64 ctrl) { barrier(); }
void __weak hw_perf_counter_setup(void) { barrier(); }
static void
list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)