In preparation for removing volatile from the atomic_t definition, this patch adds a volatile cast to all the atomic read functions. Signed-off-by: Anton Blanchard <anton@xxxxxxxxx> --- I did my best to fix every architecture, but I'd appreciate it if arch maintainers could double check this catches everything. Index: linux-cpumask/arch/alpha/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/alpha/include/asm/atomic.h 2010-04-08 19:46:03.177952918 +1000 +++ linux-cpumask/arch/alpha/include/asm/atomic.h 2010-05-17 13:21:55.353455034 +1000 @@ -17,8 +17,8 @@ #define ATOMIC_INIT(i) ( (atomic_t) { (i) } ) #define ATOMIC64_INIT(i) ( (atomic64_t) { (i) } ) -#define atomic_read(v) ((v)->counter + 0) -#define atomic64_read(v) ((v)->counter + 0) +#define atomic_read(v) (*(volatile int *)&(v)->counter) +#define atomic64_read(v) (*(volatile long *)&(v)->counter) #define atomic_set(v,i) ((v)->counter = (i)) #define atomic64_set(v,i) ((v)->counter = (i)) Index: linux-cpumask/arch/arm/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/arm/include/asm/atomic.h 2010-04-08 19:46:03.197946415 +1000 +++ linux-cpumask/arch/arm/include/asm/atomic.h 2010-05-17 13:21:55.364704766 +1000 @@ -24,7 +24,7 @@ * 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) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v,i) (((v)->counter) = (i)) #if __LINUX_ARM_ARCH__ >= 6 Index: linux-cpumask/arch/avr32/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/avr32/include/asm/atomic.h 2010-04-08 19:46:03.167946279 +1000 +++ linux-cpumask/arch/avr32/include/asm/atomic.h 2010-05-17 13:21:55.384708819 +1000 @@ -19,7 +19,7 @@ #define ATOMIC_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v, i) (((v)->counter) = i) /* Index: linux-cpumask/arch/cris/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/cris/include/asm/atomic.h 2010-04-08 19:46:03.147945641 +1000 +++ linux-cpumask/arch/cris/include/asm/atomic.h 2010-05-17 13:21:55.404706041 +1000 @@ -15,7 +15,7 @@ #define ATOMIC_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v,i) (((v)->counter) = (i)) /* These should be written in asm but we do it in C for now. */ Index: linux-cpumask/arch/frv/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/frv/include/asm/atomic.h 2010-04-08 19:46:03.397951974 +1000 +++ linux-cpumask/arch/frv/include/asm/atomic.h 2010-05-17 13:21:55.424704874 +1000 @@ -36,7 +36,7 @@ #define smp_mb__after_atomic_inc() barrier() #define ATOMIC_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v, i) (((v)->counter) = (i)) #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS Index: linux-cpumask/arch/h8300/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/h8300/include/asm/atomic.h 2010-04-08 19:46:03.237946283 +1000 +++ linux-cpumask/arch/h8300/include/asm/atomic.h 2010-05-17 13:21:55.445954164 +1000 @@ -10,7 +10,7 @@ #define ATOMIC_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v, i) (((v)->counter) = i) #include <asm/system.h> Index: linux-cpumask/arch/ia64/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/ia64/include/asm/atomic.h 2010-04-08 19:46:03.207982670 +1000 +++ linux-cpumask/arch/ia64/include/asm/atomic.h 2010-05-17 13:21:55.453760038 +1000 @@ -21,8 +21,8 @@ #define ATOMIC_INIT(i) ((atomic_t) { (i) }) #define ATOMIC64_INIT(i) ((atomic64_t) { (i) }) -#define atomic_read(v) ((v)->counter) -#define atomic64_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) +#define atomic64_read(v) (*(volatile long *)&(v)->counter) #define atomic_set(v,i) (((v)->counter) = (i)) #define atomic64_set(v,i) (((v)->counter) = (i)) Index: linux-cpumask/arch/m32r/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/m32r/include/asm/atomic.h 2010-04-08 19:46:03.377953123 +1000 +++ linux-cpumask/arch/m32r/include/asm/atomic.h 2010-05-17 13:21:55.464742675 +1000 @@ -26,7 +26,7 @@ * * 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 Index: linux-cpumask/arch/m68k/include/asm/atomic_mm.h =================================================================== --- linux-cpumask.orig/arch/m68k/include/asm/atomic_mm.h 2010-05-05 23:02:20.013473674 +1000 +++ linux-cpumask/arch/m68k/include/asm/atomic_mm.h 2010-05-17 13:21:55.485966391 +1000 @@ -15,7 +15,7 @@ #define ATOMIC_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v, i) (((v)->counter) = i) static inline void atomic_add(int i, atomic_t *v) Index: linux-cpumask/arch/m68k/include/asm/atomic_no.h =================================================================== --- linux-cpumask.orig/arch/m68k/include/asm/atomic_no.h 2010-04-08 19:46:03.277950527 +1000 +++ linux-cpumask/arch/m68k/include/asm/atomic_no.h 2010-05-17 13:21:55.485966391 +1000 @@ -15,7 +15,7 @@ #define ATOMIC_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v, i) (((v)->counter) = i) static __inline__ void atomic_add(int i, atomic_t *v) Index: linux-cpumask/arch/mips/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/mips/include/asm/atomic.h 2010-04-08 19:46:03.337946398 +1000 +++ linux-cpumask/arch/mips/include/asm/atomic.h 2010-05-17 13:21:55.523485056 +1000 @@ -29,7 +29,7 @@ * * 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 @@ -410,7 +410,7 @@ static __inline__ int atomic_add_unless( * @v: pointer of type atomic64_t * */ -#define atomic64_read(v) ((v)->counter) +#define atomic64_read(v) (*(volatile long *)&(v)->counter) /* * atomic64_set - set atomic variable Index: linux-cpumask/arch/mn10300/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/mn10300/include/asm/atomic.h 2010-04-08 19:46:03.327946770 +1000 +++ linux-cpumask/arch/mn10300/include/asm/atomic.h 2010-05-17 13:21:55.613465776 +1000 @@ -31,7 +31,7 @@ * Atomically reads the value of @v. Note that the guaranteed * useful range of an atomic_t is only 24 bits. */ -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) /** * atomic_set - set atomic variable Index: linux-cpumask/arch/parisc/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/parisc/include/asm/atomic.h 2010-04-08 19:46:03.347946599 +1000 +++ linux-cpumask/arch/parisc/include/asm/atomic.h 2010-05-17 13:21:55.643453602 +1000 @@ -189,7 +189,7 @@ static __inline__ void atomic_set(atomic static __inline__ int atomic_read(const atomic_t *v) { - return v->counter; + return (*(volatile int *)&(v)->counter); } /* exported interface */ @@ -286,7 +286,7 @@ atomic64_set(atomic64_t *v, s64 i) static __inline__ s64 atomic64_read(const atomic64_t *v) { - return v->counter; + return (*(volatile long *)&(v)->counter); } #define atomic64_add(i,v) ((void)(__atomic64_add_return( ((s64)(i)),(v)))) Index: linux-cpumask/arch/x86/include/asm/atomic64_64.h =================================================================== --- linux-cpumask.orig/arch/x86/include/asm/atomic64_64.h 2010-04-08 19:46:03.297951878 +1000 +++ linux-cpumask/arch/x86/include/asm/atomic64_64.h 2010-05-17 13:21:55.673453935 +1000 @@ -18,7 +18,7 @@ */ static inline long atomic64_read(const atomic64_t *v) { - return v->counter; + return (*(volatile long *)&(v)->counter); } /** Index: linux-cpumask/arch/sh/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/sh/include/asm/atomic.h 2010-04-08 19:46:03.227947464 +1000 +++ linux-cpumask/arch/sh/include/asm/atomic.h 2010-05-17 13:21:55.703454497 +1000 @@ -13,7 +13,7 @@ #define ATOMIC_INIT(i) ( (atomic_t) { (i) } ) -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) #define atomic_set(v,i) ((v)->counter = (i)) #if defined(CONFIG_GUSA_RB) Index: linux-cpumask/arch/sparc/include/asm/atomic_32.h =================================================================== --- linux-cpumask.orig/arch/sparc/include/asm/atomic_32.h 2010-04-08 19:46:03.247946656 +1000 +++ linux-cpumask/arch/sparc/include/asm/atomic_32.h 2010-05-17 13:21:55.723453281 +1000 @@ -25,7 +25,7 @@ extern int atomic_cmpxchg(atomic_t *, in extern int atomic_add_unless(atomic_t *, int, int); extern void atomic_set(atomic_t *, int); -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(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))) Index: linux-cpumask/arch/sparc/include/asm/atomic_64.h =================================================================== --- linux-cpumask.orig/arch/sparc/include/asm/atomic_64.h 2010-04-08 19:46:03.257945857 +1000 +++ linux-cpumask/arch/sparc/include/asm/atomic_64.h 2010-05-17 13:21:55.743456221 +1000 @@ -13,8 +13,8 @@ #define ATOMIC_INIT(i) { (i) } #define ATOMIC64_INIT(i) { (i) } -#define atomic_read(v) ((v)->counter) -#define atomic64_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) +#define atomic64_read(v) (*(volatile long *)&(v)->counter) #define atomic_set(v, i) (((v)->counter) = i) #define atomic64_set(v, i) (((v)->counter) = i) Index: linux-cpumask/arch/x86/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/x86/include/asm/atomic.h 2010-04-08 19:46:03.307951966 +1000 +++ linux-cpumask/arch/x86/include/asm/atomic.h 2010-05-17 13:21:55.743456221 +1000 @@ -22,7 +22,7 @@ */ static inline int atomic_read(const atomic_t *v) { - return v->counter; + return (*(volatile int *)&(v)->counter); } /** Index: linux-cpumask/arch/xtensa/include/asm/atomic.h =================================================================== --- linux-cpumask.orig/arch/xtensa/include/asm/atomic.h 2010-04-08 19:46:03.367946559 +1000 +++ linux-cpumask/arch/xtensa/include/asm/atomic.h 2010-05-17 13:21:55.753456882 +1000 @@ -46,7 +46,7 @@ * * 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 Index: linux-cpumask/include/asm-generic/atomic.h =================================================================== --- linux-cpumask.orig/include/asm-generic/atomic.h 2010-04-08 19:46:03.137946549 +1000 +++ linux-cpumask/include/asm-generic/atomic.h 2010-05-17 13:21:55.773453759 +1000 @@ -33,7 +33,7 @@ * Atomically reads the value of @v. Note that the guaranteed * useful range of an atomic_t is only 24 bits. */ -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) /** * atomic_set - set atomic variable -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html