powerpc/64s/exception: Remove lite interrupt return

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Regular interrupt return restores NVGPRS whereas lite returns do not.
This is clumsy: most interrupts can return without restoring NVGPRS in
most of the time, but there are special cases that require it (when
registers have been modified by the kernel). So change interrupt
return to not restore NVGPRS, and have interrupt handlers restore them
explicitly in the cases that requires it.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-30-npiggin@gmail.com

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Nicholas Piggin 2020-02-26 03:35:38 +10:00 • committed by Michael Ellerman

parent 6cc0c16d82

commit 702f098052

2 changed files with 14 additions and 16 deletions

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6

arch/powerpc/kernel/entry_64.S

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24

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

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