[PATCH v9 2/6] powerpc: platforms/Kconfig: Add qspinlock build config

[Pan Xinhui]

pSeries/powerNV will use qspinlock from now on.

Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index fbdae83..3559bbf 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -20,6 +20,15 @@ source "arch/powerpc/platforms/44x/Kconfig"
 source "arch/powerpc/platforms/40x/Kconfig"
 source "arch/powerpc/platforms/amigaone/Kconfig"
 
+config ARCH_USE_QUEUED_SPINLOCKS
+        depends on PPC_PSERIES || PPC_POWERNV
+        bool "Enable qspinlock"
+        default y
+        help
+	  Enabling this option will let kernel use qspinlock which is a kind of
+	  fairlock.  It has shown a good performance improvement on x86 and also
+	  ppc especially in high contention cases.
+
 config KVM_GUEST
 	bool "KVM Guest support"
 	default n
-- 
2.4.11