powerpc/64: Convert fast_exception_return to use RFI_TO_USER/KERNEL

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commit a08f828cf4 upstream.

Similar to the syscall return path, in fast_exception_return we may be
returning to user or kernel context. We already have a test for that,
because we conditionally restore r13. So use that existing test and
branch, and bifurcate the return based on that.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Nicholas Piggin 2018-01-10 03:07:15 +11:00 • committed by Greg Kroah-Hartman

parent 627700e455

commit bcac5d3653

1 changed files with 16 additions and 2 deletions

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arch/powerpc/kernel/entry_64.S

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