diff options
| author | Will Deacon <will.deacon@arm.com> | 2013-05-14 10:08:07 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2013-08-12 12:25:45 +0100 |
| commit | 40a5c0b415f080638a744177653aac4527002bbf (patch) | |
| tree | e789ba4420cf5dc77a8ce6466c31e2a3af4b5858 /arch/arm/common/vlock.S | |
| parent | e3ab547f57bd626201d4b715b696c80ad1ef4ba2 (diff) | |
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.S | 4 |
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) |