From 81931012bd7dc52fadf2b720605fce8a7148d4a7 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Sun, 27 Nov 2022 19:43:47 -0800 Subject: 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 Message-Id: <20221128034347.990-3-dave@stgolabs.net> Signed-off-by: Michael S. Tsirkin Reviewed-by: Xuan Zhuo --- tools/virtio/ringtest/main.h | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) (limited to 'tools') 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) \ ({ \ -- cgit v1.2.3