[PATCH v3 02/11] locking: add define if mutex_destroy() is not an empty function

[Waiman Long]

On 12/13/23 17:30, George Stark wrote:
> mutex_destroy() is only a debug helper and an empty function on non-debug
> configurations still we can't legally ignore it because it's the
> established API call and it can be extended theoretically in the future.
> Sometimes it could be useful to know e.g. in the higher-level API if
> mutex_destroy() really does something in the current configuration
> and it's should be called or skipped otherwise for the sake of
> optimization so add dedicated define to recognize these cases.
>
> Signed-off-by: George Stark <gnstark at salutedevices.com>
> ---
>   include/linux/mutex.h | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/include/linux/mutex.h b/include/linux/mutex.h
> index a33aa9eb9fc3..2395ce4fcaf6 100644
> --- a/include/linux/mutex.h
> +++ b/include/linux/mutex.h
> @@ -83,6 +83,9 @@ struct mutex {
>   
>   extern void mutex_destroy(struct mutex *lock);
>   
> +/* mutex_destroy() is a real function, not a NOP */
> +#define mutex_destroy  mutex_destroy
> +
>   #else
>   
>   # define __DEBUG_MUTEX_INITIALIZER(lockname)
Acked-by: Waiman Long <longman at redhat.com>