arm: Implement ticket spin-locks
Introduce optional ticket locks to help ensure fairness in
contended locks, as well as preventing livelock.
CRs-fixed: 302764
Signed-off-by: Brent DeGraaf <bdegraaf@codeaurora.org>
Conflicts:
arch/arm/include/asm/spinlock.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 518349f..e070f1c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -134,6 +134,15 @@
default y
depends on SMP && PREEMPT
+config ARM_TICKET_LOCKS
+ bool
+ help
+ Enable ticket locks, which help preserve fairness among
+ contended locks and prevent livelock in multicore systems.
+ Say 'y' if system stability is important.
+ default y if ARCH_MSM_SCORPIONMP
+ depends on SMP
+
config RWSEM_GENERIC_SPINLOCK
bool
default y