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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>
This commit is contained in:
Nicholas Piggin 2017-04-13 20:16:23 +10:00 committed by Michael Ellerman
parent b87ac02183
commit a5adf28246
1 changed files with 2 additions and 4 deletions
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6
arch/powerpc/include/asm/dbell.h
View File

@ -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 */