diff options
| author | Andi Kleen <ak@linux.intel.com> | 2017-03-31 11:14:40 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-03-31 16:43:37 +1100 |
| commit | 30f4f5b5df670b68a5fd848565bc7560141d667c (patch) | |
| tree | d9a54f85102bb2882b5fddcd076461e711eddb63 | |
| parent | 99ba8c438b7ce6a2cf384fa6e2074c31cd95a058 (diff) | |
kref: remove WARN_ON for NULL release functions
The kref functions check for NULL release functions. This WARN_ON seems
rather pointless. We will eventually release and then just crash nicely.
It is also somewhat expensive because these functions are inlined in a lot
of places. Removing the WARN_ONs saves around 2.3k in this kernel (likely
more in others with more drivers)
text data bss dec hex filename
9083992 5367600 11116544 25568136 1862388 vmlinux-before-load-avg
9070166 5367600 11116544 25554310 185ed86 vmlinux-load-avg
Link: http://lkml.kernel.org/r/20170315021431.13107-5-andi@firstfloor.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/kref.h | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/include/linux/kref.h b/include/linux/kref.h index f4156f88f557..29220724bf1c 100644 --- a/include/linux/kref.h +++ b/include/linux/kref.h @@ -66,8 +66,6 @@ static inline void kref_get(struct kref *kref) */ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref)) { - WARN_ON(release == NULL); - if (refcount_dec_and_test(&kref->refcount)) { release(kref); return 1; @@ -79,8 +77,6 @@ static inline int kref_put_mutex(struct kref *kref, void (*release)(struct kref *kref), struct mutex *lock) { - WARN_ON(release == NULL); - if (refcount_dec_and_mutex_lock(&kref->refcount, lock)) { release(kref); return 1; @@ -92,8 +88,6 @@ static inline int kref_put_lock(struct kref *kref, void (*release)(struct kref *kref), spinlock_t *lock) { - WARN_ON(release == NULL); - if (refcount_dec_and_lock(&kref->refcount, lock)) { release(kref); return 1; |