diff options
| -rw-r--r-- | arch/x86/include/asm/percpu.h | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index de991e6d050a..7563e69838c4 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -230,6 +230,17 @@ do { \ }) /* + * raw_cpu_xchg() can use a load-store since + * it is not required to be IRQ-safe. + */ +#define raw_percpu_xchg_op(_var, _nval) \ +({ \ + typeof(_var) pxo_old__ = raw_cpu_read(_var); \ + raw_cpu_write(_var, _nval); \ + pxo_old__; \ +}) + +/* * this_cpu_xchg() is implemented using cmpxchg without a lock prefix. * xchg is expensive due to the implied lock prefix. The processor * cannot prefetch cachelines if xchg is used. @@ -499,18 +510,6 @@ do { \ #define raw_cpu_or_1(pcp, val) percpu_to_op(1, , "or", (pcp), val) #define raw_cpu_or_2(pcp, val) percpu_to_op(2, , "or", (pcp), val) #define raw_cpu_or_4(pcp, val) percpu_to_op(4, , "or", (pcp), val) - -/* - * raw_cpu_xchg() can use a load-store since it is not required to be - * IRQ-safe. - */ -#define raw_percpu_xchg_op(var, nval) \ -({ \ - typeof(var) pxo_ret__ = raw_cpu_read(var); \ - raw_cpu_write(var, (nval)); \ - pxo_ret__; \ -}) - #define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val) #define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val) #define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val) |