powerpc/32s: Fix RTAS machine check with VMAP stack

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When we have VMAP stack, exception prolog 1 sets r1, not r11.

When it is not an RTAS machine check, don't trash r1 because it is
needed by prolog 1.

Fixes: da7bb43ab9 ("powerpc/32: Fix vmap stack - Properly set r1 before activating MMU")
Fixes: d2e0060360 ("powerpc/32: Use SPRN_SPRG_SCRATCH2 in exception prologs")
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Squash in fixup for RTAS machine check from Christophe]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bc77d61d1c18940e456a2dee464f1e2eda65a3f0.1608621048.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2020-12-22 07:11:18 +00:00 • committed by Michael Ellerman

parent e71ba9452f

commit 98bf2d3f49

1 changed files with 9 additions and 0 deletions

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arch/powerpc/kernel/head_book3s_32.S

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