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Date: Thu, 14 Mar 2013 23:43:23 +0000
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Chen Gang <gang.chen@asianux.com>
Cc: Will Deacon <will.deacon@arm.com>, nico@linaro.org, matthew.leach@arm.com,
        dave.martin@linaro.org,
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	<linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [Suggestion] Latest randconfig build errors for Head.S
Message-ID: <20130314234323.GD4977@n2100.arm.linux.org.uk>
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On Thu, Mar 14, 2013 at 12:38:00PM +0800, Chen Gang wrote:
> Hello Maintainers:
> 
>   are these warnings for head.S OK ?
> 
> 
> make:
>   make V=1 EXTRA_CFLAGS=-W ARCH=arm randconfig
>     (this time, CONFIG_MMU=y)
> 
> warning information:
>   arch/arm/boot/compressed/head.S: Assembler messages:
>   arch/arm/boot/compressed/head.S:565: Warning: (null)
>   arch/arm/boot/compressed/head.S:676: Warning: (null)
>   arch/arm/boot/compressed/head.S:698: Warning: (null)
>   arch/arm/boot/compressed/head.S:722: Warning: (null)
>   arch/arm/boot/compressed/head.S:726: Warning: (null)
>   arch/arm/boot/compressed/head.S:735: Warning: (null)
>   arch/arm/boot/compressed/head.S:978: Warning: (null)
>   arch/arm/boot/compressed/head.S:1017: Warning: (null)
>   arch/arm/boot/compressed/head.S:1018: Warning: (null)
>   arch/arm/boot/compressed/head.S:1048: Warning: (null)
>   arch/arm/boot/compressed/head.S:1055: Warning: (null)
>   arch/arm/boot/compressed/head.S:1063: Warning: (null)
>   arch/arm/boot/compressed/head.S:1074: Warning: (null)
>   arch/arm/boot/compressed/head.S:1088: Warning: (null)
>   arch/arm/boot/compressed/head.S:1120: Warning: (null)
>   arch/arm/boot/compressed/head.S:1122: Warning: (null)
>   arch/arm/boot/compressed/head.S:1123: Warning: (null)
>   arch/arm/boot/compressed/head.S:1130: Warning: (null)
>   arch/arm/boot/compressed/head.S:1162: Warning: (null)

*Sigh*

So our wonderful toolchain has decided to start producing NULL warnings
for every "mcr     p15, 0, rX, c7, c10, 4" instruction?  I'd just ignore
them and hope that the toolchain people fix it.
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