linux-kernel - Re: [RFC PATCH] ARM Fix /usr/bin/xargs: etags: Argument list too long

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Date:	Wed, 8 Aug 2012 15:59:43 +0000
From:	David Cullen <David.Cullen@...-americas.com>
To:	Michal Marek <mmarek@...e.cz>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] ARM Fix /usr/bin/xargs: etags: Argument list too
 long

On 8/8/2012 10:41 AM, Michal Marek wrote:
> Dne 8.8.2012 16:32, David Cullen napsal(a):
>> Patch applies to
>>
>>     commit 42a579a0f960081cd16fc945036e4780c3ad3202
>>
>> When running "make ARCH=arm TAGS" in a chroot using qemu-arm-static,
>> the following message is emitted:
>>
>>     [user@...t:/home/work/linux]: make ARCH=arm TAGS
>>       GEN     TAGS
>>     /usr/bin/xargs: etags: Argument list too long
>>
>> This can be fixed by by passing "-L 1024" to xargs in scripts/tags.sh.
>>
>> The "1024" was a guess. A value of "3862" changes the message to
>>
>>     /usr/bin/xargs: argument list too long
>>
>> Using "2048" also fixes the problem. However, I don't know how much
>> headroom that leaves
>>
>> Does anyone know why the argument lists must be shorter for ARM? All
>> of the documentation I have available says that 4096 should be the
>> limit.
> 
> This looks like a bug in xargs, it should make sure that the commandline
> fits into ARG_MAX.

Actually, it appears to be caused by the combination of
qemu-arm-static and xargs. When I run "make ARCH=arm TAGS" on an ARM
target, I do not see the problem.

> BTW, a better workaround would be to use the -s option, which
> limits the size of the argument list.

That works.

I'll submit another RFC patch.

-- 
Thank you,
David Cullen--
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