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powerpc/64s: Optimise clearing of MSR_EE in masked_[H]interrupt() 

MSR_EE is always enabled in SRR1 for masked interrupts, so we can use
xor to clear it.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Nicholas Piggin 2017-08-12 02:39:00 +10:00 committed by Michael Ellerman
parent e0c827c09c
commit 6e9a2f6eba
1 changed files with 1 additions and 2 deletions
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3
arch/powerpc/kernel/exceptions-64s.S
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@ -1373,8 +1373,7 @@ masked_##_H##interrupt: \
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; \
xori r10,r10,MSR_EE; /* clear MSR_EE */ \
mtspr SPRN_##_H##SRR1,r10; \
2: mtcrf 0x80,r9; \
ld r9,PACA_EXGEN+EX_R9(r13); \