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From 761cba95ae66984cf60423190aefb3b794774033 Mon Sep 17 00:00:00 2001
From: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Date: Thu, 12 Jun 2014 17:05:43 -0700
Subject: [PATCH 6/7] arm64: spinlock: sev when unlocking locks
Because spinners are doing a wfe in their poll of the lock.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
arch/arm64/include/asm/spinlock.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
index cee1287..c4df86f 100644
--- a/arch/arm64/include/asm/spinlock.h
+++ b/arch/arm64/include/asm/spinlock.h
@@ -87,6 +87,7 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
asm volatile(
" stlrh %w1, %0\n"
+" sev\n"
: "=Q" (lock->owner)
: "r" (lock->owner + 1)
: "memory");
--
2.1.1
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