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Date:	Sat, 18 Oct 2014 17:12:08 +0200
From:	Manfred Schlaegl <>
To:	Richard Weinberger <>, Jeff Dike <>
CC:	Daniel Walter <>,
	Randy Dunlap <>,,,
Subject: Re: [PATCH] um: Remove unused bp stack-frame pointer

On 2014-10-18 16:42, Richard Weinberger wrote:
> Am 18.10.2014 um 16:23 schrieb Manfred Schlaegl:
>> The pointer to bp stack-frame is no longer used. Removed it.
> Good catch!
Thank you.

>> This also removes a corresponding compiler-warning.
> Which warning exactly?

On "normal" (defconfig) builds the warning does not show up because CONFIG_FRAME_POINTER is set.
I've found the unused bp because CONFIG_FRAME_POINTER was not set in my configuration.

  CC      arch/um/kernel/sysrq.o
arch/um/kernel/sysrq.c: In function ‘show_stack’:
arch/um/kernel/sysrq.c:32:29: warning: unused variable ‘bp’ [-Wunused-variable]

It's reproducible on linus-tree (0429fbc0b) by
make mrproper
make tinyconfig ARCH=um SUBARCH=i386
make ARCH=um SUBARCH=i386

> Thanks,
> //richard
best regards,
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