ppc appears to have already supported cmpxchg-local atomic semantics that is defined by the kernel convention of the feature. Add this_cpu_cmpxchg ppc local for the performance benefit of arch sepcific implementation than asm-generic c verison of the locking API.
Signed-off-by: Luming Yu <luming...@shingroup.cn> --- arch/powerpc/include/asm/percpu.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/powerpc/include/asm/percpu.h b/arch/powerpc/include/asm/percpu.h index 8e5b7d0b851c..ceab5df6e7ab 100644 --- a/arch/powerpc/include/asm/percpu.h +++ b/arch/powerpc/include/asm/percpu.h @@ -18,5 +18,22 @@ #include <asm-generic/percpu.h> #include <asm/paca.h> +#include <asm/cmpxchg.h> +#ifdef this_cpu_cmpxchg_1 +#undef this_cpu_cmpxchg_1 +#define this_cpu_cmpxchg_1(pcp, oval, nval) __cmpxchg_local(raw_cpu_ptr(&(pcp)), oval, nval, 1) +#endif +#ifdef this_cpu_cmpxchg_2 +#undef this_cpu_cmpxchg_2 +#define this_cpu_cmpxchg_2(pcp, oval, nval) __cmpxchg_local(raw_cpu_ptr(&(pcp)), oval, nval, 2) +#endif +#ifdef this_cpu_cmpxchg_4 +#undef this_cpu_cmpxchg_4 +#define this_cpu_cmpxchg_4(pcp, oval, nval) __cmpxchg_local(raw_cpu_ptr(&(pcp)), oval, nval, 4) +#endif +#ifdef this_cpu_cmpxchg_8 +#undef this_cpu_cmpxchg_8 +#define this_cpu_cmpxchg_8(pcp, oval, nval) __cmpxchg_local(raw_cpu_ptr(&(pcp)), oval, nval, 8) +#endif #endif /* _ASM_POWERPC_PERCPU_H_ */ -- 2.42.0.windows.2
