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powerpc/64s: Avoid a branch in masked_[H]interrupt() 

Interrupts which do not require EE to be cleared can all be tested
with a single bitwise test.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-08-12 02:38:59 +10:00 committed by Michael Ellerman
parent 3a2df3798d
commit e0c827c09c
1 changed files with 2 additions and 4 deletions
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6
arch/powerpc/kernel/exceptions-64s.S
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@ -1370,10 +1370,8 @@ masked_##_H##interrupt: \
ori r10,r10,0xffff; \
mtspr SPRN_DEC,r10; \
b MASKED_DEC_HANDLER_LABEL; \
1: cmpwi r10,PACA_IRQ_DBELL; \
beq 2f; \
cmpwi r10,PACA_IRQ_HMI; \
beq 2f; \
1: andi. r10,r10,(PACA_IRQ_DBELL|PACA_IRQ_HMI); \
bne 2f; \
mfspr r10,SPRN_##_H##SRR1; \
rldicl r10,r10,48,1; /* clear MSR_EE */ \
rotldi r10,r10,16; \