linux-kernel - Re: [PATCH] powerpc/32: don't restore r0, r6-r8 on exception entry path after trace_hardirqs

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Message-Id: <48YT390jK2z9sSM@ozlabs.org>
Date:   Fri,  6 Mar 2020 11:27:33 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        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/32: don't restore r0, r6-r8 on exception entry path after trace_hardirqs_off()

On Tue, 2020-01-07 at 09:16:40 UTC, Christophe Leroy wrote:
> Since commit b86fb88855ea ("powerpc/32: implement fast entry for
> syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32:
> implement fast entry for syscalls on BOOKE"), syscalls don't
> use the exception entry path anymore. It is therefore pointless
> to restore r0 and r6-r8 after calling trace_hardirqs_off().
> 
> In the meantime, drop the '2:' label which is unused and misleading.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/05642cf7289c5562e5939d2ee8a0529d310010b8

cheers