linux-kernel - Re: [PATCH v5 06/13] lockdep: Implement crossrelease feature

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Date:   Fri, 3 Mar 2017 08:43:32 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, tglx@...utronix.de, walken@...gle.com,
        boqun.feng@...il.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        npiggin@...il.com, kernel-team@....com
Subject: Re: [PATCH v5 06/13] lockdep: Implement crossrelease feature

On Thu, Mar 02, 2017 at 02:41:03PM +0100, Peter Zijlstra wrote:
> On Wed, Jan 18, 2017 at 10:17:32PM +0900, Byungchul Park wrote:
> > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > index a6c8db1..7890661 100644
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -1042,6 +1042,19 @@ config DEBUG_LOCK_ALLOC
> >  	 spin_lock_init()/mutex_init()/etc., or whether there is any lock
> >  	 held during task exit.
> >  
> > +config LOCKDEP_CROSSRELEASE
> > +	bool "Lock debugging: make lockdep work for crosslocks"
> > +	select LOCKDEP
> > +	select TRACE_IRQFLAGS
> > +	default n
> > +	help
> > +	 This makes lockdep work for crosslock which is a lock allowed to
> > +	 be released in a different context from the acquisition context.
> > +	 Normally a lock must be released in the context acquiring the lock.
> > +	 However, relexing this constraint helps synchronization primitives
> > +	 such as page locks or completions can use the lock correctness
> > +	 detector, lockdep.
> > +
> >  config PROVE_LOCKING
> >  	bool "Lock debugging: prove locking correctness"
> >  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
> 
> 
> Does CROSSRELEASE && !PROVE_LOCKING make any sense?

No, it does not make sense. I will fix it. Thank you.