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| author | Linus Walleij <linus.walleij@linaro.org> | 2016-03-10 09:29:25 +0700 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-03-10 09:29:25 +0700 |
| commit | cc998d8bc74341f6bbbcd63ab4449a6acfc45ee9 (patch) | |
| tree | 2f4e23fa1ceb83b3e720afd52d9a5ef2be26c77e /tools/virtio/asm/barrier.h | |
| parent | d2d13ed01362ecddc3f76f9cca31b0cd5d663a7e (diff) | |
| parent | 81f70ba233d5f660e1ea5fe23260ee323af5d53a (diff) | |
| download | talos-op-linux-cc998d8bc74341f6bbbcd63ab4449a6acfc45ee9.tar.gz talos-op-linux-cc998d8bc74341f6bbbcd63ab4449a6acfc45ee9.zip | |
Merge tag 'v4.5-rc5' into devel
Linux 4.5-rc5
Diffstat (limited to 'tools/virtio/asm/barrier.h')
| -rw-r--r-- | tools/virtio/asm/barrier.h | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/tools/virtio/asm/barrier.h b/tools/virtio/asm/barrier.h index 26b7926bda88..ba34f9e96efd 100644 --- a/tools/virtio/asm/barrier.h +++ b/tools/virtio/asm/barrier.h @@ -1,15 +1,19 @@ #if defined(__i386__) || defined(__x86_64__) #define barrier() asm volatile("" ::: "memory") -#define mb() __sync_synchronize() - -#define smp_mb() mb() -# define dma_rmb() barrier() -# define dma_wmb() barrier() -# define smp_rmb() barrier() -# define smp_wmb() barrier() +#define virt_mb() __sync_synchronize() +#define virt_rmb() barrier() +#define virt_wmb() barrier() +/* Atomic store should be enough, but gcc generates worse code in that case. */ +#define virt_store_mb(var, value) do { \ + typeof(var) virt_store_mb_value = (value); \ + __atomic_exchange(&(var), &virt_store_mb_value, &virt_store_mb_value, \ + __ATOMIC_SEQ_CST); \ + barrier(); \ +} while (0); /* Weak barriers should be used. If not - it's a bug */ -# define rmb() abort() -# define wmb() abort() +# define mb() abort() +# define rmb() abort() +# define wmb() abort() #else #error Please fill in barrier macros #endif |
