aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/common/vlock.S
diff options
context:
space:
mode:
authorWill Deacon <will.deacon@arm.com>2013-05-14 10:08:07 +0100
committerWill Deacon <will.deacon@arm.com>2013-08-12 12:25:45 +0100
commit40a5c0b415f080638a744177653aac4527002bbf (patch)
treee789ba4420cf5dc77a8ce6466c31e2a3af4b5858 /arch/arm/common/vlock.S
parente3ab547f57bd626201d4b715b696c80ad1ef4ba2 (diff)
downloadlinux-linaro-stable-40a5c0b415f080638a744177653aac4527002bbf.tar.gz
ARM: mcpm: use -st dsb option prior to sev instructions
In a similar manner to our spinlock implementation, mcpm uses sev to wake up cores waiting on a lock when the lock is unlocked. In order to ensure that the final write unlocking the lock is visible, a dsb instruction is executed immediately prior to the sev. This patch changes these dsbs to use the -st option, since we only require that the store unlocking the lock is made visible. Acked-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Dave Martin <dave.martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/common/vlock.S')
-rw-r--r--arch/arm/common/vlock.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/common/vlock.S b/arch/arm/common/vlock.S
index ff198583f683..8b7df283fedf 100644
--- a/arch/arm/common/vlock.S
+++ b/arch/arm/common/vlock.S
@@ -42,7 +42,7 @@
dmb
mov \rscratch, #0
strb \rscratch, [\rbase, \rcpu]
- dsb
+ dsb st
sev
.endm
@@ -102,7 +102,7 @@ ENTRY(vlock_unlock)
dmb
mov r1, #VLOCK_OWNER_NONE
strb r1, [r0, #VLOCK_OWNER_OFFSET]
- dsb
+ dsb st
sev
bx lr
ENDPROC(vlock_unlock)