linux-kernel - Re: [PATCH] arm, vt8500, LLVMLlinux: Use mcr instead of mcr% for mach-vt8500

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Date:	Wed, 24 Sep 2014 11:16:24 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Behan Webster <behanw@...verseincode.com>, linux@....linux.org.uk,
	linux@...sktech.co.nz, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm, vt8500, LLVMLlinux: Use mcr instead of mcr% for mach-vt8500

On Tuesday 23 September 2014 20:44:44 Behan Webster wrote:
> The ASM below does not compile with clang and is not the way that the mcr
> command is used in other parts of the kernel.
> 
> arch/arm/mach-vt8500/vt8500.c:72:11: error: invalid % escape in inline assembly string
>         asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
>             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
> 
> There are other forms that are supported on different ARM instruction sets but
> generally the kernel just uses mcr as it is supported in all ARM instruction
> sets.

Just for confirm: both forms are actually correct and we don't need this
backported for stable, right?

> Signed-off-by: Behan Webster <behanw@...verseincode.com>
> Reviewed-by: Mark Charlebois <charlebm@...il.com>
> Acked-by: Will Deacon <will.deacon@....com>

Acked-by: Arnd Bergmann <arnd@...db.de>

Tony, would you like to pick this one up and send it in a pull request
to arm-soc, or should we apply it to fixes-non-critical directly?

	Arnd
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