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From: "tip-bot2 for Waiman Long" <tip-bot2@linutronix.de>
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To: linux-tip-commits@vger.kernel.org
Subject: [tip: locking/core] locking/qspinlock: Fix 'wait_early' set but not
used warning
Cc: kernel test robot <lkp@intel.com>, Waiman Long <longman@redhat.com>,
Ingo Molnar <mingo@kernel.org>, Boqun Feng <boqun.feng@gmail.com>,
Linus Torvalds <torvalds@linux-foundation.org>, x86@kernel.org,
linux-kernel@vger.kernel.org
In-Reply-To: <20240222150540.79981-2-longman@redhat.com>
References: <20240222150540.79981-2-longman@redhat.com>
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[tip:,locking/core] locking/qspinlock: Fix 'wait_early' set but not used warning
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Commit Message
tip-bot2 for Thomas Gleixner
Feb. 28, 2024, 12:53 p.m. UTC
The following commit has been merged into the locking/core branch of tip: Commit-ID: ca4bc2e07b716509fd279d2b449bb42f4263a9c8 Gitweb: https://git.kernel.org/tip/ca4bc2e07b716509fd279d2b449bb42f4263a9c8 Author: Waiman Long <longman@redhat.com> AuthorDate: Thu, 22 Feb 2024 10:05:37 -05:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Wed, 28 Feb 2024 13:08:37 +01:00 locking/qspinlock: Fix 'wait_early' set but not used warning When CONFIG_LOCK_EVENT_COUNTS is off, the wait_early variable will be set but not used. This is expected. Recent compilers will not generate wait_early code in this case. Add the __maybe_unused attribute to wait_early for suppressing this W=1 warning. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20240222150540.79981-2-longman@redhat.com Closes: https://lore.kernel.org/oe-kbuild-all/202312260422.f4pK3f9m-lkp@intel.com/ --- kernel/locking/qspinlock_paravirt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index 6a0184e..ae2b12f 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -294,8 +294,8 @@ static void pv_wait_node(struct mcs_spinlock *node, struct mcs_spinlock *prev) { struct pv_node *pn = (struct pv_node *)node; struct pv_node *pp = (struct pv_node *)prev; + bool __maybe_unused wait_early; int loop; - bool wait_early; for (;;) { for (wait_early = false, loop = SPIN_THRESHOLD; loop; loop--) {