linux-kernel - Re: [Suggestion] ARM64: kernel: compiling issue, need implement cmpxchg64 with assembler language.

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Date:	Fri, 19 Apr 2013 14:12:54 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Tony Lindgren <tony@...mide.com>,
	"olof@...om.net" <olof@...om.net>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Suggestion] ARM64: kernel: compiling issue, need implement cmpxchg64 with assembler language.

On Friday 19 April 2013, Chen Gang wrote:
> in arch/arm64/include/asm, not define the function cmpxchg64
> 
>   when compiling with allmodconfig,
>     drivers/block/blockconsole.c will need this function.
> 
>   I am not quite familiar with ARM64 (neither ARM64 assembler)
> 
>   can any member helps to send related patch ?
>     if no one have time to send related patch, I should try.
>     and I am glad to try, but need additional time resources,
>     if I try, I should finish it within this month (2013-4-30).
> 
>   welcome any suggestions or completions.

cmpxchg64 is the same as cmpxchg on 64-bit platforms, can't the
driver be changed to use the latter?

	Arnd
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