linux-kernel - Re: [PATCH v5 5/7] arm64, jump label: detect %c support for ARM64

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Message-ID: <20131030004927.GD25346@mudshark.cambridge.arm.com>
Date:	Wed, 30 Oct 2013 00:49:27 +0000
From:	Will Deacon <will.deacon@....com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 5/7] arm64, jump label: detect %c support for ARM64

On Fri, Oct 18, 2013 at 04:19:59PM +0100, Jiang Liu wrote:
> From: Jiang Liu <jiang.liu@...wei.com>
> 
> As commit a9468f30b5eac6 "ARM: 7333/2: jump label: detect %c
> support for ARM", this patch detects the same thing for ARM64
> because some ARM64 GCC versions have the same issue.
> 
> Some versions of ARM64 GCC which do support asm goto, do not
> support the %c specifier. Since we need the %c to support jump
> labels on ARM64, detect that too in the asm goto detection script
> to avoid build errors with these versions.

Acked-by: Will Deacon <will.deacon@....com>

The toolchain is being fixed upstream for this, but we should have the check
for older versions.

Will
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