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| author | Waiman Long <longman@redhat.com> | 2019-02-25 02:14:13 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-02-28 07:55:38 +0100 |
| commit | 733000c7ffd9d9c8c4fdfd82f0d41956c8cf0537 (patch) | |
| tree | 6e38cfcfeba4e5e5539a5822ef6fe04a5bc7e929 /kernel/locking | |
| parent | locking/percpu-rwsem: Remove preempt_disable variants (diff) | |
| download | linux-733000c7ffd9d9c8c4fdfd82f0d41956c8cf0537.tar.xz linux-733000c7ffd9d9c8c4fdfd82f0d41956c8cf0537.zip | |
locking/qspinlock: Remove unnecessary BUG_ON() call
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 actually be triggered.
Remove it.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/1551057253-3231-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/qspinlock.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 21ee51b47961..5e9247dc2515 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 */ |