Christophe Leroy writes:
> Le 22/12/2020 à 08:11, Christophe Leroy a écrit :
>> When we have VMAP stack, exception prolog 1 sets r1, not r11.
>
> But exception prolog 1 uses r1 to setup r1 when machine check happens in
> kernel.
> So r1 must be restored when the branch is not taken. See
Le 22/12/2020 à 08:11, Christophe Leroy a écrit :
When we have VMAP stack, exception prolog 1 sets r1, not r11.
But exception prolog 1 uses r1 to setup r1 when machine check happens in kernel.
So r1 must be restored when the branch is not taken. See subsequent patch I
just sent out.
When it is not a RTAS machine check, don't trash r1
because it is needed by prolog 1.
Fixes: 9c7422b92cb2 ("powerpc/32s: Fix RTAS machine check with VMAP stack")
Cc: sta...@vger.kernel.org
Signed-off-by: Christophe Leroy
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Sorry Michael for this last minute fix of the fix.
On Tue, 22 Dec 2020 07:11:18 + (UTC), Christophe Leroy wrote:
> When we have VMAP stack, exception prolog 1 sets r1, not r11.
Applied to powerpc/fixes.
[1/1] powerpc/32s: Fix RTAS machine check with VMAP stack
https://git.kernel.org/powerpc/c/9c7422b92cb27369653c371ad9c44a502e5eea8f
When we have VMAP stack, exception prolog 1 sets r1, not r11.
Fixes: da7bb43ab9da ("powerpc/32: Fix vmap stack - Properly set r1 before
activating MMU")
Fixes: d2e006036082 ("powerpc/32: Use SPRN_SPRG_SCRATCH2 in exception prologs")
Cc: sta...@vger.kernel.org
Signed-off-by: Christophe Leroy
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