linux-kernel - Re: [PATCH] arm: remove tautologic #ifdefs in proc-v7-3level.S

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Date:	Tue, 29 Mar 2016 10:05:58 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>,
	linux-kernel@...r.kernel.org, linux@....linux.org.uk
Subject: Re: [PATCH] arm: remove tautologic #ifdefs in proc-v7-3level.S

On Tuesday 29 March 2016 09:37:51 Jonas Rabenstein wrote:
> The file arch/arm/mm/proc-v7-3level.S is only used by the #include
> directive in arch/arm/mm/proc-v7.S:23. This #include is conditional and
> depends on  CONFIG_ARM_LPAE (otherwise proc-v7-2level.S is used).
> CONFIG_ARM_LPAE has a dependency on CONFIG_MMU defined in Kconfig.
> Consequently, checks for CONFIG_MMU in proc-v7-3level.S are superfluous.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
> ---
>  I detected the issue with chimaera, a tool I currently develop for my bachelor
>  thesis extending the undertaker tool suite (https://undertaker.cs.fau.de).

Nice catch!

Reviewed-by: Arnd Bergmann <arnd@...db.de>

I guess you should submit the same thing for the other file as well,
either in the same patch or as a series.

You can also add

Fixes: 8d2cd3a38fd6 ("ARM: LPAE: Factor out classic-MMU specific code into proc-v7-2level.S")

to mark the commit that led to the situation.

	Arnd