linux-kernel - Re: [PATCH] um: Remove unused bp stack-frame pointer

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Message-ID: <544289F8.3020704@nod.at>
Date:	Sat, 18 Oct 2014 17:40:40 +0200
From:	Richard Weinberger <richard@....at>
To:	Manfred Schlaegl <manfred.schlaegl@....at>,
	Jeff Dike <jdike@...toit.com>
CC:	Daniel Walter <dwalter@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	user-mode-linux-devel@...ts.sourceforge.net,
	user-mode-linux-user@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] um: Remove unused bp stack-frame pointer

Am 18.10.2014 um 17:24 schrieb Manfred Schlaegl:
> On 2014-10-18 17:19, Richard Weinberger wrote:
>> Am 18.10.2014 um 17:12 schrieb Manfred Schlaegl:
>>> 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]
>>
>> Looks like my gcc need's an upgrade. :D
>>
>> Thanks,
>> //richard
>>
> 
> I'm using gcc version 4.7.2 (Debian 4.7.2-5). -> not THAT new ;-)

With a cup of coffee applied I managed it to read your mail correctly.
The warning triggers only with CONFIG_FRAME_POINTER=n. Now it makes sense.

Thanks,
//richard
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