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authorLinus Torvalds <torvalds@linux-foundation.org>2015-08-31 15:01:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-08-31 15:01:08 -0700
commit7b8067d37058ec01889513e16033fb6de72a98ce (patch)
tree697e66a89f37eeaf223f1e62d4ac1a5b3b6e6d90 /arch
parent9551bf292d67e9070409b59685cdb8fc5437ec3a (diff)
parent8f8dcb3f7fe4febbfa96e64d4ad47de958c5cc34 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha
Pull alpha update from Matt Turner: "A single patch for alpha, one that enables ARCH_USE_CMPXCHG_LOCKREF and offers around an 8% performance improvement on a little benchmark that you wrote" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha: alpha: select CONFIG_ARCH_USE_CMPXCHG_LOCKREF.
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/Kconfig1
-rw-r--r--arch/alpha/include/asm/spinlock.h5
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index bf9e9d3b3792..f515a4dbf7a0 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -3,6 +3,7 @@ config ALPHA
default y
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
+ select ARCH_USE_CMPXCHG_LOCKREF
select HAVE_AOUT
select HAVE_IDE
select HAVE_OPROFILE
diff --git a/arch/alpha/include/asm/spinlock.h b/arch/alpha/include/asm/spinlock.h
index 37b570d01202..fed9c6f44c19 100644
--- a/arch/alpha/include/asm/spinlock.h
+++ b/arch/alpha/include/asm/spinlock.h
@@ -16,6 +16,11 @@
#define arch_spin_unlock_wait(x) \
do { cpu_relax(); } while ((x)->lock)
+static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
+{
+ return lock.lock == 0;
+}
+
static inline void arch_spin_unlock(arch_spinlock_t * lock)
{
mb();