linux-kernel - Re: [PATCH v2 0/9] liblockdep: userspace lockdep

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Date:	Thu, 09 May 2013 08:42:40 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	torvalds@...ux-foundation.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/9] liblockdep: userspace lockdep

On 05/09/2013 04:54 AM, Peter Zijlstra wrote:
> On Thu, May 09, 2013 at 12:19:07AM -0400, Sasha Levin wrote:
>> liblockdep is a tiny wrapper built around kernel/lockdep.c. The aim is to
>> provide the same functionality the kernel gets from lockdep to userspace.
>>
>> The bulk of the code here is the LD_PRELOAD support which provides users
>> an easy way to test their code without having to integrate liblockdep into
>> said code. Simply doing:
>>
>>         lockdep my_app
>>
>> 	Would provide lockdep support to my_app.
>>
>> 	There is also a small test suite to test both mutexes and rwlocks, it's
>> 	based on the tests in lib/locking-selftest.c.
>>
>> 	This entire patch series was reviewed by lockdep maintainers and accepted to
>> 	the tip tree previously. It was pulled out so that the potential merge of
>> 	liblockdep won't delay the rest of the commits in the tip locking tree.
>>
>> 	For some more background about this entire thing, the folks at LWN did
>> 	an awesome overview: http://lwn.net/Articles/536363/
>>
>>
>> Changes from v1:
>>  - Addressed Peter's comments.
>>
> 
> root@...ns:/usr/src/linux-2.6/tools/lib/lockdep# make
>   CC FPIC            common.o
> In file included from ./uinclude/linux/lockdep.h:13:0,
>                  from /usr/src/linux-2.6/tools/lib/lockdep/common.c:4:
> ./../../../include/linux/lockdep.h:21:27: fatal error: linux/linkage.h: No such file or directory
> compilation terminated.
> make: *** [common.o] Error 1

Oh, Ingo had a similar problem - you're using Quilt and that mishandles the
creation of empty files. You'll need to poke it stronger :)

I did notice a different issue due to a recent commit to kernel/lockdep.c, I'll
resend it again.


Thanks,
Sasha
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