linux-kernel - Re: [RFC][PATCH 0/7] lockdep: Support recurise-read locks

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Message-Id: <201104220919.p3M9JWfw029700@www262.sakura.ne.jp>
Date:	Fri, 22 Apr 2011 18:19:32 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	yong.zhang0@...il.com
Cc:	a.p.zijlstra@...llo.nl, rostedt@...dmis.org, tglx@...utronix.de,
	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/7] lockdep: Support recurise-read locks

Yong Zhang wrote:
> 2011/4/22 Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>:
> >> But if you call locktest1/locktest2 firstly, the chain will not be established
> >> just because recursive read is not added to prev->after.
> >
> > This part is not OK. At least, I think lockdep should be able to establish the
> > chain when locktest1 is called AGAIN after locktest2 is called (i.e.
> > "cat /proc/locktest1 /proc/locktest2 /proc/locktest1" case).
> 
> I guess lockdep will warn on "cat /proc/locktest1 /proc/locktest2
> /proc/locktest1"

It should warn, but it doesn't warn.
You can confirm it using locktest.c in this thread.
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