powerpc/64s/kuap: Restore AMR in fast_interrupt_return

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Interrupts that use fast_interrupt_return actually do lock AMR, but
they have been ones which tend to come from userspace (or kernel bugs)
in radix mode. With kuap on hash, segment interrupts are taken in
kernel often, which quickly breaks due to the missing restore.

Fixes: 890274c2dc ("powerpc/64s: Implement KUAP for Radix MMU")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200429065654.1677541-6-npiggin@gmail.com

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Nicholas Piggin 2020-04-29 16:56:53 +10:00 • committed by Michael Ellerman

parent 53459dc970

commit c44dc6323c

1 changed files with 3 additions and 1 deletions

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arch/powerpc/kernel/entry_64.S

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