diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2022-11-28 06:43:47 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-12-28 13:28:11 +0300 |
| commit | 81931012bd7dc52fadf2b720605fce8a7148d4a7 (patch) | |
| tree | b7bca86d0c4b590f5f861a9818cc3cc61e61d375 /tools/virtio/ringtest | |
| parent | 8aeac42d60936046a00e67cdf7d27b061df2962f (diff) | |
| download | linux-81931012bd7dc52fadf2b720605fce8a7148d4a7.tar.xz | |
tools/virtio: remove smp_read_barrier_depends()
This gets rid of the last references to smp_read_barrier_depends()
which for the kernel side was removed in v5.9. The serialization
required for Alpha is done inside READ_ONCE() instead of having
users deal with it. Simply use a full barrier, the architecture
does not have rmb in the first place.
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Message-Id: <20221128034347.990-3-dave@stgolabs.net>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Diffstat (limited to 'tools/virtio/ringtest')
| -rw-r--r-- | tools/virtio/ringtest/main.h | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h index 9ed09caa659e..b68920d52750 100644 --- a/tools/virtio/ringtest/main.h +++ b/tools/virtio/ringtest/main.h @@ -140,12 +140,6 @@ static inline void busy_wait(void) #define smp_wmb() smp_release() #endif -#ifdef __alpha__ -#define smp_read_barrier_depends() smp_acquire() -#else -#define smp_read_barrier_depends() do {} while(0) -#endif - static __always_inline void __read_once_size(const volatile void *p, void *res, int size) { @@ -175,13 +169,22 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s } } +#ifdef __alpha__ #define READ_ONCE(x) \ ({ \ union { typeof(x) __val; char __c[1]; } __u; \ __read_once_size(&(x), __u.__c, sizeof(x)); \ - smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \ + smp_mb(); /* Enforce dependency ordering from x */ \ __u.__val; \ }) +#else +#define READ_ONCE(x) \ +({ \ + union { typeof(x) __val; char __c[1]; } __u; \ + __read_once_size(&(x), __u.__c, sizeof(x)); \ + __u.__val; \ +}) +#endif #define WRITE_ONCE(x, val) \ ({ \ |