linux-kernel - hrtimers and lockdep (was: Re: 2.6.24-rc6: possible recursive locking detected)

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Message-Id: <1201689272.28547.204.camel@lappy>
Date:	Wed, 30 Jan 2008 11:34:32 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: hrtimers and lockdep (was: Re: 2.6.24-rc6: possible recursive
	locking detected)

( trimmed CC list )

Sorry for the delay, this message seems to have gotten lost in my
inbox :-/

On Tue, 2008-01-15 at 00:27 +0300, Oleg Nesterov wrote:
> On 01/13, Peter Zijlstra wrote:

> Offtopic question. Why do we have so many lockdep stuff in timer.c and hrtimer.c ?
> We never lock 2 bases at the same time, except in migrate_timers(). We can kill
> double_spin_lock() and base_lock_keys[] and just use spin_lock_nested in
> migrate_timers(), no?

Lets ask Thomas.. :-)

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