powerpc/32: Use SPRN_SPRG_SCRATCH2 in exception prologs

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Use SPRN_SPRG_SCRATCH2 as a third scratch register in
exception prologs in order to simplify them and avoid
data going back and forth from/to CR.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6f5c8a7faa8cc54acb89c55c20aa579a2f30a4e9.1606285014.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2020-11-25 07:10:53 +00:00 • committed by Michael Ellerman

parent de1cd07906

commit d2e0060360

1 changed files with 7 additions and 15 deletions

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arch/powerpc/kernel/head_32.h

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