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Commit 6e9a2f6e authored Aug 12, 2017 by Nicholas Piggin Committed by Michael Ellerman Aug 23, 2017

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>

parent e0c827c0

arch/powerpc/kernel/exceptions-64s.S

+1 −2

Original line number	Diff line number	Diff line
		@@ -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); \