[PATCH] ARM: Don't enable GENERIC_LOCKBREAK with ticket spinlocks

Now that ARM has implemented its spinlocks with tickets we don't
need to use the generic lockbreak algorithm. Remove the Kconfig
from ARM so that we use the arch_spin_is_contended() definition
from the asm header. This also saves a word in each lock because
we don't need the break_lock member anymore.

Signed-off-by: Stephen Boyd <redacted>
---

It seems we define the arch_spin_is_contended() macro but we don't
use it on SMP && PREEMPT kernels?

 arch/arm/Kconfig | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e91c7cd..e4191cc 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -126,11 +126,6 @@ config TRACE_IRQFLAGS_SUPPORT
 	bool
 	default y
 
-config GENERIC_LOCKBREAK
-	bool
-	default y
-	depends on SMP && PREEMPT
-
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

On Fri, Aug 03, 2012 at 11:42:42PM +0100, Stephen Boyd wrote:

Now that ARM has implemented its spinlocks with tickets we don't
need to use the generic lockbreak algorithm. Remove the Kconfig
from ARM so that we use the arch_spin_is_contended() definition
from the asm header. This also saves a word in each lock because
we don't need the break_lock member anymore.

Signed-off-by: Stephen Boyd <redacted>
---

It seems we define the arch_spin_is_contended() macro but we don't
use it on SMP && PREEMPT kernels?

Thanks, I missed that.

Acked-by: Will Deacon <redacted>

Will