linux-kernel - Re: [tip:core/locking] locking: Check spinlock_t/rwlock

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Message-ID: <20090802180557.GA316@elte.hu>
Date:	Sun, 2 Aug 2009 20:05:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dave <kilroyd@...glemail.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/locking] locking: Check spinlock_t/rwlock_t argument
	type on non-SMP builds too


* Dave <kilroyd@...glemail.com> wrote:

> Ingo Molnar wrote:
> > * tip-bot for David Kilroy <kilroyd@...glemail.com> wrote:
> > 
> >> Commit-ID:  02626aa5ecc03f94585164b97bedabe15302e3c3
> >> Gitweb:     http://git.kernel.org/tip/02626aa5ecc03f94585164b97bedabe15302e3c3
> >> Author:     David Kilroy <kilroyd@...glemail.com>
> >> AuthorDate: Wed, 22 Jul 2009 19:11:35 +0100
> >> Committer:  Ingo Molnar <mingo@...e.hu>
> >> CommitDate: Sun, 2 Aug 2009 14:59:29 +0200
> >>
> >> locking: Check spinlock_t/rwlock_t argument type on non-SMP builds too
> > 
> > -tip testing found UP crashes and i bisected it down to:
> > 
> >  02626aa5ecc03f94585164b97bedabe15302e3c3 is first bad commit
> >  commit 02626aa5ecc03f94585164b97bedabe15302e3c3
> >  Author: David Kilroy <kilroyd@...glemail.com>
> >  Date:   Wed Jul 22 19:11:35 2009 +0100
> > 
> >     locking: Check spinlock_t/rwlock_t argument type on non-SMP builds too
> > 
> > the crash looks like this:
> > 
> > [   55.257999] ip[3699]: segfault at 31108c6d80 ip 00000031108c6d80 sp 00007fff4aa183d8 error 14
> > 
> > sometimes it's just a spontaneous reboot with no log message.
> 
> 
> Crap. Looking really carefully:
> 
> +static inline int _spin_trylock_bh(spinlock_t *lock)
> +{ __LOCK(lock); return 1; }
> 
> Should have been:
> 
> +static inline int _spin_trylock_bh(spinlock_t *lock)
> +{ __LOCK_BH(lock); return 1; }
> 
> I can't say if that's definitely causing your issue, but it's 
> certainly wrong. I'll go through it all again, and send a v3 of 
> the patch.

Ok. (Note, please preserve the (minimally) edited changelog you can 
find in the v2 commit email)

	Ingo
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