linux-kernel - Re: [PATCH] powerpc/32s: Fix RTAS machine check with VMAP stack

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Message-ID: <87im8s6mjc.fsf@mpe.ellerman.id.au>
Date:   Thu, 24 Dec 2020 12:05:43 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32s: Fix RTAS machine check with VMAP stack

Christophe Leroy <christophe.leroy@...roup.eu> 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 subsequent patch I just sent out.

OK. This is still on the tip of fixes, so I'll rewind it to drop this
commit, and then apply this and the fixup as one patch next week.

cheers