diff mbox series

[15/20] futex: Simplify double_lock_hb()

Message ID 20210915141525.556892413@infradead.org
State Not applicable
Headers
Series futex: splitup and waitv syscall |

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent

Commit Message

Peter Zijlstra Sept. 15, 2021, 2:07 p.m. UTC 
  Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/futex/futex.h |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
diff mbox series

Patch

--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -316,14 +316,12 @@  extern void futex_q_unlock(struct futex_
 static inline void
 double_lock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
 {
-	if (hb1 <= hb2) {
-		spin_lock(&hb1->lock);
-		if (hb1 < hb2)
-			spin_lock_nested(&hb2->lock, SINGLE_DEPTH_NESTING);
-	} else { /* hb1 > hb2 */
-		spin_lock(&hb2->lock);
-		spin_lock_nested(&hb1->lock, SINGLE_DEPTH_NESTING);
-	}
+	if (hb1 > hb2)
+		swap(hb1, hb2);
+
+	spin_lock(&hb1->lock);
+	if (hb1 != hb2)
+		spin_lock_nested(&hb2->lock, SINGLE_DEPTH_NESTING);
 }
 
 static inline void