On Thu, 2012-08-09 at 12:57 -0400, Nicolas Pitre wrote:
>
> In other words, I think this should look like this:
>
> diff --git a/include/asm-generic/mutex-xchg.h
> b/include/asm-generic/mutex-xchg.h
> index 580a6d35c7..44a66c99c8 100644
> --- a/include/asm-generic/mutex-xchg.h
> +++ b/include/asm-generic/mutex-xchg.h
> @@ -25,8 +25,11 @@
> static inline void
> __mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *))
> {
> - if (unlikely(atomic_xchg(count, 0) != 1))
> - fail_fn(count);
> + if (unlikely(atomic_xchg(count, 0) != 1)) {
> + /* Mark lock contention explicitly */
> + if (likely(atomic_xchg(count, -1) != 1))
> + fail_fn(count);
> + }
> }
OK, I like this.. Thanks guys! Will will you send a final and complete
patch?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
