Commit 01ea1cca authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

perf_counter: more barrier in blank weak function 



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: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e44aef58

kernel/perf_counter.c

+2 −2
Original line number Diff line number Diff line
@@ -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)