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authorWaiman Long <Waiman.Long@hp.com>2015-05-10 21:17:10 -0400
committerIngo Molnar <mingo@kernel.org>2015-05-11 09:51:52 +0200
commit52c9d2badd1ae4d11c29de57d4e964e48afd3cb4 (patch)
tree00edebb52a79aec06420e26520d788d0e0373cbc /kernel/locking
parente95e6f176c61dd0e7bd9fdfb4956df1f9bfe99d4 (diff)
downloadop-kernel-dev-52c9d2badd1ae4d11c29de57d4e964e48afd3cb4.zip
op-kernel-dev-52c9d2badd1ae4d11c29de57d4e964e48afd3cb4.tar.gz
locking/pvqspinlock: Replace xchg() by the more descriptive set_mb()
The xchg() function was used in pv_wait_node() to set a certain value and provide a memory barrier which is what the set_mb() function is for. This patch replaces the xchg() call by set_mb(). Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Waiman Long <Waiman.Long@hp.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/qspinlock_paravirt.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index b5758a9..27ab96d 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -175,7 +175,7 @@ static void pv_wait_node(struct mcs_spinlock *node)
*
* Matches the xchg() from pv_kick_node().
*/
- (void)xchg(&pn->state, vcpu_halted);
+ set_mb(pn->state, vcpu_halted);
if (!READ_ONCE(node->locked))
pv_wait(&pn->state, vcpu_halted);
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