From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org, Waiman Long <longman@redhat.com>
Subject: [PATCH-tip] locking/qspinlock: Remove unnecessary BUG_ON() call
Date: Sun, 24 Feb 2019 20:14:13 -0500 [thread overview]
Message-ID: <1551057253-3231-1-git-send-email-longman@redhat.com> (raw)
With the > 4 nesting levels case handled by the commit d682b596d993
("locking/qspinlock: Handle > 4 slowpath nesting levels"), the BUG_ON()
call in encode_tail() will never be triggered. Remove it.
Signed-off-by: Waiman Long <longman@redhat.com>
---
kernel/locking/qspinlock.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c
index 21ee51b..5e9247d 100644
--- a/kernel/locking/qspinlock.c
+++ b/kernel/locking/qspinlock.c
@@ -124,9 +124,6 @@ static inline __pure u32 encode_tail(int cpu, int idx)
{
u32 tail;
-#ifdef CONFIG_DEBUG_SPINLOCK
- BUG_ON(idx > 3);
-#endif
tail = (cpu + 1) << _Q_TAIL_CPU_OFFSET;
tail |= idx << _Q_TAIL_IDX_OFFSET; /* assume < 4 */
--
1.8.3.1
next reply other threads:[~2019-02-25 1:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-25 1:14 Waiman Long [this message]
2019-02-25 12:12 ` Will Deacon
2019-02-28 7:02 ` [tip:locking/core] " tip-bot for Waiman Long
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