powerpc/powermac: Fix low_sleep_handler with CONFIG_VMAP_STACK

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low_sleep_handler() can't restore the context from standard
stack because the stack can hardly be accessed with MMU OFF.

Store everything in a global storage area instead of storing
a pointer to the stack in that global storage area.

To avoid a complete churn of the function, still use r1 as
the pointer to the storage area during restore.

Fixes: cd08f109e2 ("powerpc/32s: Enable CONFIG_VMAP_STACK")
Reported-by: Giuseppe Sacco <giuseppe@sguazz.it>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-by: Giuseppe Sacco <giuseppe@sguazz.it>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e3e0d8042a3ba75cb4a9546c19c408b5b5b28994.1607404931.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2020-12-08 05:24:19 +00:00 • committed by Michael Ellerman

parent f8a4b277c3

commit db972a3787

2 changed files with 60 additions and 74 deletions

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arch/powerpc/platforms/Kconfig.cputype

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132

arch/powerpc/platforms/powermac/sleep.S

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