[PATCH] powerpc/6xx: Fix power_save_ppc32_restore() with CONFIG_VMAP_STACK

[Michael Ellerman]

On Fri, 2020-02-14 at 06:53:00 UTC, Christophe Leroy wrote:
> power_save_ppc32_restore() is called during exception entry, before
> re-enabling the MMU. It substracts KERNELBASE from the address
> of nap_save_msscr0 to access it.
> 
> With CONFIG_VMAP_STACK enabled, data MMU translation has already been
> re-enabled, so power_save_ppc32_restore() has to access
> nap_save_msscr0 by its virtual address.
> 
> Reported-by: Larry Finger <Larry.Finger at lwfinger.net>
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STACK")
> Tested-by: Larry Finger <Larry.Finger at lwfinger.net>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/477f3488a94e35380c82a7498d46f10fa5f3edd2

cheers