This really should've been Cc'ed to me.
On Thu, Feb 15, 2018 at 03:19:42PM +0100, Christian König wrote:
> diff --git a/include/linux/ww_mutex.h b/include/linux/ww_mutex.h
> index 39fda195bf78..dd580db289e8 100644
> --- a/include/linux/ww_mutex.h
> +++ b/include/linux/ww_mutex.h
> @@ -358,4 +358,21 @@ static inline bool ww_mutex_is_locked(struct ww_mutex
> *lock)
> return mutex_is_locked(&lock->base);
> }
>
> +/**
> + * ww_mutex_is_owned_by - is the w/w mutex locked by this task in that
> context
> + * @lock: the mutex to be queried
> + * @task: the task structure to check
> + * @ctx: the w/w acquire context to test
> + *
> + * Returns true if the mutex is locked in the context by the given task,
> false
> + * otherwise.
> + */
> +static inline bool ww_mutex_is_owned_by(struct ww_mutex *lock,
> + struct task_struct *task,
> + struct ww_acquire_ctx *ctx)
> +{
> + return likely(__mutex_owner(&lock->base) == task) &&
> + READ_ONCE(lock->ctx) == ctx;
> +}
Nak on that interface, that's racy and broken by design.
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