>
> Impact: fix panic possible panic etc
>
> some compiler seems to inline the weak global function if no line in it
>
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
>
> diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
> index d7a79f3..37f7716 100644
> --- a/kernel/perf_counter.c
> +++ b/kernel/perf_counter.c
> @@ -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(); }
We need comment into the function.
I expect anyone think "hm, this barrier() is meaningless. let's cleanup." in the future.
we should avoid it.
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