migrate_disable pushd down in atomic_dec_and_spin_lock

PATCH In review Nicholas Mc Guire 1 participant 1 message Nov 30, 2013

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Nicholas Mc Guire

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2013-11-30 03:07 UTC #0 lore raw

PATCH 3/4 migrate_disable pushd down in atomic_dec_and_spin_lock

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From 44d3537f3d7053562aeef2739c460f472c78da71 Mon Sep 17 00:00:00 2001

From: Nicholas Mc Guire <[email protected]>
Date: Fri, 29 Nov 2013 00:19:41 -0500
Subject: [PATCH 3/4] migrate_disable pushd down in atomic_dec_and_spin_lock

Signed-off-by Nicholas Mc Guire <[email protected]>

---
 kernel/rtmutex.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

kernel/rtmutex.c +3 -3

index 891ac58..f99e85a 100644
@@ -952,12 +952,12 @@ int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock)
 	/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
 	if (atomic_add_unless(atomic, -1, 1))
 		return 0;
-	migrate_disable();
 	rt_spin_lock(lock);
-	if (atomic_dec_and_test(atomic))
+	if (atomic_dec_and_test(atomic)){
+		migrate_disable();
 		return 1;
+	}
 	rt_spin_unlock(lock);
-	migrate_enable();
 	return 0;
 }
 EXPORT_SYMBOL(atomic_dec_and_spin_lock);

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