powerpc/64/kuap: Conditionally restore AMR in interrupt exit

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The AMR update is made conditional on AMR actually changing, which
should be the less common case on most workloads (though kernel page
faults on uaccess could be frequent, this doesn't significantly slow
down that case).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200429065654.1677541-4-npiggin@gmail.com

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Nicholas Piggin 2020-04-29 16:56:51 +10:00 • committed by Michael Ellerman

parent cb2b53cbff

commit 579940bb45

2 changed files with 29 additions and 7 deletions

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22

arch/powerpc/include/asm/book3s/64/kup-radix.h

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14

arch/powerpc/kernel/syscall_64.c

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