summaryrefslogtreecommitdiffstats
path: root/tools/virtio/ringtest/main.h
diff options
context:
space:
mode:
Diffstat (limited to 'tools/virtio/ringtest/main.h')
-rw-r--r--tools/virtio/ringtest/main.h37
1 files changed, 20 insertions, 17 deletions
diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h
index 6d1fccd3d86c..b68920d52750 100644
--- a/tools/virtio/ringtest/main.h
+++ b/tools/virtio/ringtest/main.h
@@ -140,25 +140,19 @@ 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)
{
- switch (size) { \
- case 1: *(unsigned char *)res = *(volatile unsigned char *)p; break; \
- case 2: *(unsigned short *)res = *(volatile unsigned short *)p; break; \
- case 4: *(unsigned int *)res = *(volatile unsigned int *)p; break; \
- case 8: *(unsigned long long *)res = *(volatile unsigned long long *)p; break; \
- default: \
- barrier(); \
- __builtin_memcpy((void *)res, (const void *)p, size); \
- barrier(); \
- } \
+ switch (size) {
+ case 1: *(unsigned char *)res = *(volatile unsigned char *)p; break;
+ case 2: *(unsigned short *)res = *(volatile unsigned short *)p; break;
+ case 4: *(unsigned int *)res = *(volatile unsigned int *)p; break;
+ case 8: *(unsigned long long *)res = *(volatile unsigned long long *)p; break;
+ default:
+ barrier();
+ __builtin_memcpy((void *)res, (const void *)p, size);
+ barrier();
+ }
}
static __always_inline void __write_once_size(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) \
({ \