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

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Message-ID: <54230C1A.30801@prisktech.co.nz>
Date:	Thu, 25 Sep 2014 06:23:22 +1200
From:	Tony Prisk <linux@...sktech.co.nz>
To:	Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
CC:	Behan Webster <behanw@...verseincode.com>, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm, vt8500, LLVMLlinux: Use mcr instead of mcr% for
 mach-vt8500


On 24/09/14 21:16, Arnd Bergmann wrote:
> 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
Arnd,

You can apply it directly to fixes-non-critical if that's ok.

Regards
Tony Prisk
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