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locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read()

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Use the much more reader friendly ACCESS_ONCE() instead of the cast to volatile.
This is purely a stylistic change.

Signed-off-by: Pranith Kumar <[email protected]>
Acked-by: Jesper Nilsson <[email protected]>
Acked-by: Hans-Christian Egtvedt <[email protected]>
Acked-by: Max Filippov <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Pranith Kumar 2014-09-23 10:29:50 -04:00 • committed by Ingo Molnar
commit 2291059c85
18 changed files with 24 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

4
arch/alpha/include/asm/atomic.h
View file

@ -17,8 +17,8 @@
#define ATOMIC_INIT(i) { (i) }
#define ATOMIC64_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic64_read(v) (*(volatile long *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic64_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v,i) ((v)->counter = (i))
#define atomic64_set(v,i) ((v)->counter = (i))

2
arch/arm/include/asm/atomic.h
View file

@ -27,7 +27,7 @@
* strex/ldrex monitor on some implementations. The reason we can use it for
* atomic_set() is the clrex or dummy strex done on every exception return.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
#if __LINUX_ARM_ARCH__ >= 6

4
arch/arm64/include/asm/atomic.h
View file

@ -35,7 +35,7 @@
* strex/ldrex monitor on some implementations. The reason we can use it for
* atomic_set() is the clrex or dummy strex done on every exception return.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
/*
@ -139,7 +139,7 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
*/
#define ATOMIC64_INIT(i) { (i) }
#define atomic64_read(v) (*(volatile long *)&(v)->counter)
#define atomic64_read(v) ACCESS_ONCE((v)->counter)
#define atomic64_set(v,i) (((v)->counter) = (i))
#define ATOMIC64_OP(op, asm_op) \

2
arch/avr32/include/asm/atomic.h
View file

@ -19,7 +19,7 @@
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v, i) (((v)->counter) = i)
#define ATOMIC_OP_RETURN(op, asm_op, asm_con) \

2
arch/cris/include/asm/atomic.h
View file

@ -17,7 +17,7 @@
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
/* These should be written in asm but we do it in C for now. */

2
arch/frv/include/asm/atomic.h
View file

@ -31,7 +31,7 @@
*/
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v, i) (((v)->counter) = (i))
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS

4
arch/ia64/include/asm/atomic.h
View file

@ -21,8 +21,8 @@
#define ATOMIC_INIT(i) { (i) }
#define ATOMIC64_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic64_read(v) (*(volatile long *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic64_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
#define atomic64_set(v,i) (((v)->counter) = (i))

2
arch/m32r/include/asm/atomic.h
View file

@ -28,7 +28,7 @@
*
* Atomically reads the value of @v.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
/**
* atomic_set - set atomic variable

2
arch/m68k/include/asm/atomic.h
View file

@ -17,7 +17,7 @@
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v, i) (((v)->counter) = i)
/*

4
arch/mips/include/asm/atomic.h
View file

@ -29,7 +29,7 @@
*
* Atomically reads the value of @v.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
/*
* atomic_set - set atomic variable
@ -306,7 +306,7 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
* @v: pointer of type atomic64_t
*
*/
#define atomic64_read(v) (*(volatile long *)&(v)->counter)
#define atomic64_read(v) ACCESS_ONCE((v)->counter)
/*
* atomic64_set - set atomic variable

4
arch/parisc/include/asm/atomic.h
View file

@ -67,7 +67,7 @@ static __inline__ void atomic_set(atomic_t *v, int i)
static __inline__ int atomic_read(const atomic_t *v)
{
return (*(volatile int *)&(v)->counter);
return ACCESS_ONCE((v)->counter);
}
/* exported interface */
@ -204,7 +204,7 @@ atomic64_set(atomic64_t *v, s64 i)
static __inline__ s64
atomic64_read(const atomic64_t *v)
{
return (*(volatile long *)&(v)->counter);
return ACCESS_ONCE((v)->counter);
}
#define atomic64_inc(v) (atomic64_add( 1,(v)))

2
arch/sh/include/asm/atomic.h
View file

@ -14,7 +14,7 @@
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v,i) ((v)->counter = (i))
#if defined(CONFIG_GUSA_RB)

2
arch/sparc/include/asm/atomic_32.h
View file

@ -26,7 +26,7 @@ int atomic_cmpxchg(atomic_t *, int, int);
int __atomic_add_unless(atomic_t *, int, int);
void atomic_set(atomic_t *, int);
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic_add(i, v) ((void)atomic_add_return( (int)(i), (v)))
#define atomic_sub(i, v) ((void)atomic_add_return(-(int)(i), (v)))

4
arch/sparc/include/asm/atomic_64.h
View file

@ -14,8 +14,8 @@
#define ATOMIC_INIT(i) { (i) }
#define ATOMIC64_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic64_read(v) (*(volatile long *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#define atomic64_read(v) ACCESS_ONCE((v)->counter)
#define atomic_set(v, i) (((v)->counter) = i)
#define atomic64_set(v, i) (((v)->counter) = i)

2
arch/x86/include/asm/atomic.h
View file

@ -24,7 +24,7 @@
*/
static inline int atomic_read(const atomic_t *v)
{
return (*(volatile int *)&(v)->counter);
return ACCESS_ONCE((v)->counter);
}
/**

2
arch/x86/include/asm/atomic64_64.h
View file

@ -18,7 +18,7 @@
*/
static inline long atomic64_read(const atomic64_t *v)
{
return (*(volatile long *)&(v)->counter);
return ACCESS_ONCE((v)->counter);
}
/**

2
arch/xtensa/include/asm/atomic.h
View file

@ -47,7 +47,7 @@
*
* Atomically reads the value of @v.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
/**
* atomic_set - set atomic variable

2
include/asm-generic/atomic.h
View file

@ -126,7 +126,7 @@ ATOMIC_OP(or, |)
* Atomically reads the value of @v.
*/
#ifndef atomic_read
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic_read(v) ACCESS_ONCE((v)->counter)
#endif
/**