linux-kernel - Re: [PATCH] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error

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Date:   Fri, 12 Feb 2021 11:19:54 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error

On Mon, 8 Feb 2021 07:17:40 +0000 (UTC), Christophe Leroy wrote:
> THREAD_ALIGN_SHIFT = THREAD_SHIFT + 1 = PAGE_SHIFT + 1
> Maximum PAGE_SHIFT is 18 for 256k pages so
> THREAD_ALIGN_SHIFT is 19 at the maximum.
> 
> No need to clobber cr1, it can be preserved when moving r1
> into CR when we check stack overflow.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/32: Preserve cr1 in exception prolog stack check to fix build error
      https://git.kernel.org/powerpc/c/3642eb21256a317ac14e9ed560242c6d20cf06d9

cheers