[PATCH 22/24] make atomic_read() behave consistently on x86_64
From: Chris Snook <hidden>
Date: 2007-08-09 14:19:39
Also in:
linux-arch, lkml
From: Chris Snook <redacted> Make atomic_read() consistent with atomic64_read() and other architectures on x86_64. Signed-off-by: Chris Snook <redacted>
--- linux-2.6.23-rc2-orig/include/asm-x86_64/atomic.h 2007-07-08 19:32:17.000000000 -0400
+++ linux-2.6.23-rc2/include/asm-x86_64/atomic.h 2007-08-09 07:51:40.000000000 -0400@@ -32,7 +32,7 @@ typedef struct { int counter; } atomic_t * * Atomically reads the value of @v. */ -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) /** * atomic_set - set atomic variable
@@ -206,7 +206,7 @@ static __inline__ int atomic_sub_return( /* An 64bit atomic type */ -typedef struct { volatile long counter; } atomic64_t; +typedef struct { long counter; } atomic64_t; #define ATOMIC64_INIT(i) { (i) }
@@ -217,7 +217,7 @@ typedef struct { volatile long counter; * Atomically reads the value of @v. * Doesn't imply a read memory barrier. */ -#define atomic64_read(v) ((v)->counter) +#define atomic64_read(v) (*(volatile long *)&(v)->counter) /** * atomic64_set - set atomic64 variable