linux-kernel - [tip:locking/core] locking/qspinlock: Remove duplicate clear

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Date:   Fri, 27 Apr 2018 04:01:31 -0700
From:   tip-bot for Will Deacon <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, mingo@...nel.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, will.deacon@....com, longman@...hat.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org
Subject: [tip:locking/core] locking/qspinlock: Remove duplicate
 clear_pending() function from PV code

Commit-ID:  3bea9adc96842b8a7345c7fb202c16ae9c8d5b25
Gitweb:     https://git.kernel.org/tip/3bea9adc96842b8a7345c7fb202c16ae9c8d5b25
Author:     Will Deacon <will.deacon@....com>
AuthorDate: Fri, 27 Apr 2018 10:40:13 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Apr 2018 12:55:22 +0200

locking/qspinlock: Remove duplicate clear_pending() function from PV code

The native clear_pending() function is identical to the PV version, so the
latter can simply be removed.

This fixes the build for systems with >= 16K CPUs using the PV lock implementation.

Reported-by: Waiman Long <longman@...hat.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: boqun.feng@...il.com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: paulmck@...ux.vnet.ibm.com
Link: http://lkml.kernel.org/r/20180427101619.GB21705@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/qspinlock_paravirt.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index 25730b2ac022..5a0cf5f9008c 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -130,11 +130,6 @@ static __always_inline void set_pending(struct qspinlock *lock)
 	atomic_or(_Q_PENDING_VAL, &lock->val);
 }
 
-static __always_inline void clear_pending(struct qspinlock *lock)
-{
-	atomic_andnot(_Q_PENDING_VAL, &lock->val);
-}
-
 static __always_inline int trylock_clear_pending(struct qspinlock *lock)
 {
 	int val = atomic_read(&lock->val);