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| author | Olof Johansson <olof@lixom.net> | 2013-08-29 19:12:04 -0700 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2013-08-29 19:12:04 -0700 |
| commit | 2bbc31ef2b398d17016c6438016cc76913990950 (patch) | |
| tree | 10de572013948341054d73acfab0f6d77ae35cbd /include/linux/spinlock.h | |
| parent | a3e008d1b5e39abe81e233bde623604841ff9a73 (diff) | |
| parent | af0721966195b3966214edd54af0d5f84d65419a (diff) | |
Merge tag 'omap-for-v3.12/fixes-non-critical-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/fixes-non-critical
From Tony Lindgren:
Omap fixes for the merge window that are not urgent enough
for the -rc series.
* tag 'omap-for-v3.12/fixes-non-critical-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP2: use 'int' instead of 'unsigned' for variable 'gpmc_irq_start'
ARM: OMAP2: remove useless variable 'ret'
ARM: OMAP: dma: fix error return code in omap_system_dma_probe()
ARM: OMAP2+: fix wrong address when loading PRM_FRAC_INCREMENTOR_DENUMERATOR_RELOAD
ARM: OMAP2+: am33xx-restart: trigger warm reset on omap2+ boards
ARM: OMAP2: Use a consistent AM33XX SoC option description
ARM: OMAP2+: Remove legacy device creation for McPDM and DMIC
+ Linux 3.11-rc6
Diffstat (limited to 'include/linux/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 7d537ced949a..75f34949d9ab 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -117,9 +117,17 @@ do { \ #endif /*arch_spin_is_contended*/ #endif -/* The lock does not imply full memory barrier. */ -#ifndef ARCH_HAS_SMP_MB_AFTER_LOCK -static inline void smp_mb__after_lock(void) { smp_mb(); } +/* + * Despite its name it doesn't necessarily has to be a full barrier. + * It should only guarantee that a STORE before the critical section + * can not be reordered with a LOAD inside this section. + * spin_lock() is the one-way barrier, this LOAD can not escape out + * of the region. So the default implementation simply ensures that + * a STORE can not move into the critical section, smp_wmb() should + * serialize it with another STORE done by spin_lock(). + */ +#ifndef smp_mb__before_spinlock +#define smp_mb__before_spinlock() smp_wmb() #endif /** |