Op 31-07-2021 om 10:24 schreef Desmond Cheong Zhi Xi:
> From: Peter Zijlstra <pet...@infradead.org>
>
> Extract lockdep_assert{,_once}() helpers to more easily write composite
> assertions like, for example:
>
> lockdep_assert(lockdep_is_held(&drm_device.master_mutex) ||
> lockdep_is_held(&drm_file.master_lookup_lock));
>
> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
> Signed-off-by: Desmond Cheong Zhi Xi <desmondcheon...@gmail.com>
> Acked-by: Boqun Feng <boqun.f...@gmail.com>
> Acked-by: Waiman Long <long...@redhat.com>
> ---
> include/linux/lockdep.h | 41 +++++++++++++++++++++--------------------
> 1 file changed, 21 insertions(+), 20 deletions(-)
>
> diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
> index 5cf387813754..9fe165beb0f9 100644
> --- a/include/linux/lockdep.h
> +++ b/include/linux/lockdep.h
> @@ -306,31 +306,29 @@ extern void lock_unpin_lock(struct lockdep_map *lock,
> struct pin_cookie);
>
> #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
>
> -#define lockdep_assert_held(l) do {
> \
> - WARN_ON(debug_locks && \
> - lockdep_is_held(l) == LOCK_STATE_NOT_HELD); \
> - } while (0)
> +#define lockdep_assert(cond) \
> + do { WARN_ON(debug_locks && !(cond)); } while (0)
>
> -#define lockdep_assert_not_held(l) do { \
> - WARN_ON(debug_locks && \
> - lockdep_is_held(l) == LOCK_STATE_HELD); \
> - } while (0)
> +#define lockdep_assert_once(cond) \
> + do { WARN_ON_ONCE(debug_locks && !(cond)); } while (0)
>
> -#define lockdep_assert_held_write(l) do { \
> - WARN_ON(debug_locks && !lockdep_is_held_type(l, 0)); \
> - } while (0)
> +#define lockdep_assert_held(l) \
> + lockdep_assert(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
>
> -#define lockdep_assert_held_read(l) do { \
> - WARN_ON(debug_locks && !lockdep_is_held_type(l, 1)); \
> - } while (0)
> +#define lockdep_assert_not_held(l) \
> + lockdep_assert(lockdep_is_held(l) != LOCK_STATE_HELD)
>
> -#define lockdep_assert_held_once(l) do { \
> - WARN_ON_ONCE(debug_locks && !lockdep_is_held(l)); \
> - } while (0)
> +#define lockdep_assert_held_write(l) \
> + lockdep_assert(lockdep_is_held_type(l, 0))
>
> -#define lockdep_assert_none_held_once() do {
> \
> - WARN_ON_ONCE(debug_locks && current->lockdep_depth); \
> - } while (0)
> +#define lockdep_assert_held_read(l) \
> + lockdep_assert(lockdep_is_held_type(l, 1))
> +
> +#define lockdep_assert_held_once(l) \
> + lockdep_assert_once(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
> +
> +#define lockdep_assert_none_held_once() \
> + lockdep_assert_once(!current->lockdep_depth)
>
> #define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
>
> @@ -407,6 +405,9 @@ extern int lock_is_held(const void *);
> extern int lockdep_is_held(const void *);
> #define lockdep_is_held_type(l, r) (1)
>
> +#define lockdep_assert(c) do { } while (0)
> +#define lockdep_assert_once(c) do { } while (0)
> +
> #define lockdep_assert_held(l) do { (void)(l); } while
> (0)
> #define lockdep_assert_not_held(l) do { (void)(l); } while (0)
> #define lockdep_assert_held_write(l) do { (void)(l); } while (0)
All other macros seem to do (void)(c); in this case?
Otherwise looks good.
