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powerpc/64s: masked_interrupt() returns to kernel so avoid restoring r13 

Places in the kernel where r13 is not the PACA pointer must have
maskable interrupts disabled, so r13 does not have to be restored when
returning from a soft-masked interrupt. We should never have
interrupts soft disabled when we're in user space.

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 02:39:01 +10:00 committed by Michael Ellerman
parent 6e9a2f6eba
commit c05f0be888
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/exceptions-64s.S
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@ -1379,7 +1379,7 @@ masked_##_H##interrupt: \
ld r9,PACA_EXGEN+EX_R9(r13); \
ld r10,PACA_EXGEN+EX_R10(r13); \
ld r11,PACA_EXGEN+EX_R11(r13); \
GET_SCRATCH0(r13); \
/* returns to kernel where r13 must be set up, so don't restore it */ \
##_H##rfid; \
b .; \
MASKED_DEC_HANDLER(_H)