diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2015-12-27 13:10:52 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-01-12 19:46:46 +0100 |
| commit | 57f7c0370f386d5e0960e25d2c3ceb0b8e8c489d (patch) | |
| tree | 67ca06dd81773d44151edf8a0b6a56d29bedef6a /include | |
| parent | lcoking/barriers, arch: Use smp barriers in smp_store_release() (diff) | |
| download | linux-57f7c0370f386d5e0960e25d2c3ceb0b8e8c489d.tar.xz linux-57f7c0370f386d5e0960e25d2c3ceb0b8e8c489d.zip | |
asm-generic: guard smp_store_release/load_acquire
Allow architectures to override smp_store_release
and smp_load_acquire by guarding the defines
in asm-generic/barrier.h with ifndef directives.
This is in preparation to reusing asm-generic/barrier.h
on architectures which have their own definition
of these macros.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/barrier.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h index 0f45f93ef692..987b2e04ad5a 100644 --- a/include/asm-generic/barrier.h +++ b/include/asm-generic/barrier.h @@ -104,13 +104,16 @@ #define smp_mb__after_atomic() smp_mb() #endif +#ifndef smp_store_release #define smp_store_release(p, v) \ do { \ compiletime_assert_atomic_type(*p); \ smp_mb(); \ WRITE_ONCE(*p, v); \ } while (0) +#endif +#ifndef smp_load_acquire #define smp_load_acquire(p) \ ({ \ typeof(*p) ___p1 = READ_ONCE(*p); \ @@ -118,6 +121,7 @@ do { \ smp_mb(); \ ___p1; \ }) +#endif #endif /* !__ASSEMBLY__ */ #endif /* __ASM_GENERIC_BARRIER_H */ |