linux-kernel - Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64

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Date:	Mon, 14 Oct 2013 23:57:29 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64

On 10/14/2013 11:40 PM, Russell King - ARM Linux wrote:
> On Sun, Oct 13, 2013 at 10:50:20PM +0800, Jiang Liu wrote:
>> To enable this feature, your toolchain must support "asm goto" extension
>> and "%c" constraint extesion. Current GCC for AARCH64 doesn't support
>> "%c", so you need a GCC patch similiar to this:
> 
> Oh god, not that again.  I've no idea why ARM stuff has such a problem with
> supporting this very useful "%c" GCC constraint.  Aarch32 didn't for ages
> consequently we now have horrid hacks around it in the kernel source
> because our compilers suck.  Seems Aarch64 is doomed to repeat the same
> stupid mistakes. :(
> 
We need to do the same trick for ARM64 too:)
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