linux-kernel - Re: [PATCH AUTOSEL 4.4 13/17] ARM: davinci: fix sleep.S build error on ARMv4

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Date:   Fri, 2 Aug 2019 21:02:04 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "# 3.4.x" <stable@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH AUTOSEL 4.4 13/17] ARM: davinci: fix sleep.S build error
 on ARMv4

On Fri, Aug 2, 2019 at 3:27 PM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> [ Upstream commit d64b212ea960db4276a1d8372bd98cb861dfcbb0 ]
>
> When building a multiplatform kernel that includes armv4 support,
> the default target CPU does not support the blx instruction,
> which leads to a build failure:
>
> arch/arm/mach-davinci/sleep.S: Assembler messages:
> arch/arm/mach-davinci/sleep.S:56: Error: selected processor does not support `blx ip' in ARM mode
>
> Add a .arch statement in the sources to make this file build.
>
> Link: https://lore.kernel.org/r/20190722145211.1154785-1-arnd@arndb.de
> Acked-by: Sekhar Nori <nsekhar@...com>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Olof Johansson <olof@...om.net>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

This patch is actually never needed on any stable kernels, but it is also
harmless.

      Arnd