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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-04-13 12:16:23 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-13 15:34:34 +0200 |
| commit | a5adf282461fb6048973ca3aec590495bdbc33f1 (patch) | |
| tree | 6669b7ef6c5613c8cb70f02c478885f234594a65 | |
| parent | powerpc: Introduce msgsnd/doorbell barrier primitives (diff) | |
| download | linux-a5adf282461fb6048973ca3aec590495bdbc33f1.tar.xz linux-a5adf282461fb6048973ca3aec590495bdbc33f1.zip | |
powerpc/64s: Avoid a branch for ppc_msgsnd
IPIs are a pretty hot path and we already have the ability to do asm feature
patching, so use it.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Change log detail]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/include/asm/dbell.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/dbell.h b/arch/powerpc/include/asm/dbell.h index 350694a1a6e5..040944659a20 100644 --- a/arch/powerpc/include/asm/dbell.h +++ b/arch/powerpc/include/asm/dbell.h @@ -38,10 +38,8 @@ enum ppc_dbell { static inline void _ppc_msgsnd(u32 msg) { - if (cpu_has_feature(CPU_FTR_HVMODE)) - __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); - else - __asm__ __volatile__ (PPC_MSGSNDP(%0) : : "r" (msg)); + __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0) + : : "i" (CPU_FTR_HVMODE), "r" (msg)); } /* sync before sending message */ |