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author | Peter Zijlstra <peterz@infradead.org> | 2014-03-23 19:02:22 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-08-14 12:48:08 +0200 |
commit | c9ebe21b204f95e3aba84ee91c8b9347d73806f1 (patch) | |
tree | abf61d62414e8578e381da5bbd7875abeda82781 /arch/m32r | |
parent | 08be2dab191431f23f5f98ba2db76513d0d853e7 (diff) | |
download | lwn-c9ebe21b204f95e3aba84ee91c8b9347d73806f1.tar.gz lwn-c9ebe21b204f95e3aba84ee91c8b9347d73806f1.zip |
locking,arch,m32r: Fold atomic_ops
Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.
This also prepares for easy addition of new ops.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: linux-m32r-ja@ml.linux-m32r.org
Cc: linux-m32r@ml.linux-m32r.org
Link: http://lkml.kernel.org/r/20140508135852.318635136@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/m32r')
-rw-r--r-- | arch/m32r/include/asm/atomic.h | 143 |
1 files changed, 57 insertions, 86 deletions
diff --git a/arch/m32r/include/asm/atomic.h b/arch/m32r/include/asm/atomic.h index 8ad0ed4182a5..3946b2c8d971 100644 --- a/arch/m32r/include/asm/atomic.h +++ b/arch/m32r/include/asm/atomic.h @@ -39,85 +39,64 @@ */ #define atomic_set(v,i) (((v)->counter) = (i)) -/** - * atomic_add_return - add integer to atomic variable and return it - * @i: integer value to add - * @v: pointer of type atomic_t - * - * Atomically adds @i to @v and return (@i + @v). - */ -static __inline__ int atomic_add_return(int i, atomic_t *v) -{ - unsigned long flags; - int result; - - local_irq_save(flags); - __asm__ __volatile__ ( - "# atomic_add_return \n\t" - DCACHE_CLEAR("%0", "r4", "%1") - M32R_LOCK" %0, @%1; \n\t" - "add %0, %2; \n\t" - M32R_UNLOCK" %0, @%1; \n\t" - : "=&r" (result) - : "r" (&v->counter), "r" (i) - : "memory" #ifdef CONFIG_CHIP_M32700_TS1 - , "r4" -#endif /* CONFIG_CHIP_M32700_TS1 */ - ); - local_irq_restore(flags); - - return result; +#define __ATOMIC_CLOBBER , "r4" +#else +#define __ATOMIC_CLOBBER +#endif + +#define ATOMIC_OP(op) \ +static __inline__ void atomic_##op(int i, atomic_t *v) \ +{ \ + unsigned long flags; \ + int result; \ + \ + local_irq_save(flags); \ + __asm__ __volatile__ ( \ + "# atomic_" #op " \n\t" \ + DCACHE_CLEAR("%0", "r4", "%1") \ + M32R_LOCK" %0, @%1; \n\t" \ + #op " %0, %2; \n\t" \ + M32R_UNLOCK" %0, @%1; \n\t" \ + : "=&r" (result) \ + : "r" (&v->counter), "r" (i) \ + : "memory" \ + __ATOMIC_CLOBBER \ + ); \ + local_irq_restore(flags); \ +} \ + +#define ATOMIC_OP_RETURN(op) \ +static __inline__ int atomic_##op##_return(int i, atomic_t *v) \ +{ \ + unsigned long flags; \ + int result; \ + \ + local_irq_save(flags); \ + __asm__ __volatile__ ( \ + "# atomic_" #op "_return \n\t" \ + DCACHE_CLEAR("%0", "r4", "%1") \ + M32R_LOCK" %0, @%1; \n\t" \ + #op " %0, %2; \n\t" \ + M32R_UNLOCK" %0, @%1; \n\t" \ + : "=&r" (result) \ + : "r" (&v->counter), "r" (i) \ + : "memory" \ + __ATOMIC_CLOBBER \ + ); \ + local_irq_restore(flags); \ + \ + return result; \ } -/** - * atomic_sub_return - subtract integer from atomic variable and return it - * @i: integer value to subtract - * @v: pointer of type atomic_t - * - * Atomically subtracts @i from @v and return (@v - @i). - */ -static __inline__ int atomic_sub_return(int i, atomic_t *v) -{ - unsigned long flags; - int result; - - local_irq_save(flags); - __asm__ __volatile__ ( - "# atomic_sub_return \n\t" - DCACHE_CLEAR("%0", "r4", "%1") - M32R_LOCK" %0, @%1; \n\t" - "sub %0, %2; \n\t" - M32R_UNLOCK" %0, @%1; \n\t" - : "=&r" (result) - : "r" (&v->counter), "r" (i) - : "memory" -#ifdef CONFIG_CHIP_M32700_TS1 - , "r4" -#endif /* CONFIG_CHIP_M32700_TS1 */ - ); - local_irq_restore(flags); - - return result; -} +#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) -/** - * atomic_add - add integer to atomic variable - * @i: integer value to add - * @v: pointer of type atomic_t - * - * Atomically adds @i to @v. - */ -#define atomic_add(i,v) ((void) atomic_add_return((i), (v))) +ATOMIC_OPS(add) +ATOMIC_OPS(sub) -/** - * atomic_sub - subtract the atomic variable - * @i: integer value to subtract - * @v: pointer of type atomic_t - * - * Atomically subtracts @i from @v. - */ -#define atomic_sub(i,v) ((void) atomic_sub_return((i), (v))) +#undef ATOMIC_OPS +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP /** * atomic_sub_and_test - subtract value from variable and test result @@ -151,9 +130,7 @@ static __inline__ int atomic_inc_return(atomic_t *v) : "=&r" (result) : "r" (&v->counter) : "memory" -#ifdef CONFIG_CHIP_M32700_TS1 - , "r4" -#endif /* CONFIG_CHIP_M32700_TS1 */ + __ATOMIC_CLOBBER ); local_irq_restore(flags); @@ -181,9 +158,7 @@ static __inline__ int atomic_dec_return(atomic_t *v) : "=&r" (result) : "r" (&v->counter) : "memory" -#ifdef CONFIG_CHIP_M32700_TS1 - , "r4" -#endif /* CONFIG_CHIP_M32700_TS1 */ + __ATOMIC_CLOBBER ); local_irq_restore(flags); @@ -280,9 +255,7 @@ static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr) : "=&r" (tmp) : "r" (addr), "r" (~mask) : "memory" -#ifdef CONFIG_CHIP_M32700_TS1 - , "r5" -#endif /* CONFIG_CHIP_M32700_TS1 */ + __ATOMIC_CLOBBER ); local_irq_restore(flags); } @@ -302,9 +275,7 @@ static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr) : "=&r" (tmp) : "r" (addr), "r" (mask) : "memory" -#ifdef CONFIG_CHIP_M32700_TS1 - , "r5" -#endif /* CONFIG_CHIP_M32700_TS1 */ + __ATOMIC_CLOBBER ); local_irq_restore(flags); } |