linux-kernel - Re: [PATCH 1/3] arch/um/Makefile: remove dead code

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Date:	Thu, 04 Jul 2013 23:14:58 +0200
From:	Richard Weinberger <richard@....at>
To:	Ramkumar Ramachandra <artagnon@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Jeff Dike <jdike@...toit.com>
Subject: Re: [PATCH 1/3] arch/um/Makefile: remove dead code

Am 04.07.2013 23:03, schrieb Ramkumar Ramachandra:
> arch/um/Makefile is included in the toplevel Makefile:495.  Well before
> that, it unconditionally sets $SUBARCH (in Makefile:168) as follows:
> 
>   SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
> 				    -e s/sun4u/sparc64/ \
> 				    -e s/arm.*/arm/ -e s/sa110/arm/ \
> 				    -e s/s390x/s390/ -e s/parisc64/parisc/ \
> 				    -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
> 				    -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
> 
> It is clearly impossible for $SUBARCH to be set as i386 or x86_64.
> Therefore, any code that checks $SUBARCH against these values is dead
> code.

No.
If you build UML for x86_64 you override SUBARCH.
i.e. make linux ARCH=um SUBARCH=x86_64

> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Richard Weinberger <richard@....at>
> Cc: Jeff Dike <jdike@...toit.com>
> Signed-off-by: Ramkumar Ramachandra <artagnon@...il.com>

NAK.

Thanks,
//richard

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