linux-kernel - Re: [PATCH v8 00/14] lockdep: Implement crossrelease feature

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Date:   Thu, 17 Aug 2017 16:33:13 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Byungchul Park <byungchul.park@....com>,
        Thomas Gleixner <tglx@...utronix.de>, peterz@...radead.org,
        walken@...gle.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, willy@...radead.org, npiggin@...il.com,
        kernel-team@....com
Subject: Re: [PATCH v8 00/14] lockdep: Implement crossrelease feature

On Thu, Aug 17, 2017 at 10:12:24AM +0200, Ingo Molnar wrote:
> 
> * Boqun Feng <boqun.feng@...il.com> wrote:
> 
> > > BTW., I don't think the #ifdef is necessary: lockdep_init_map_crosslock should map 
> > > to nothing when lockdep is disabled, right?
> > 
> > IIUC, lockdep_init_map_crosslock is only defined when
> > CONFIG_LOCKDEP_CROSSRELEASE=y,
> 
> Then lockdep_init_map_crosslock() should be defined in the !LOCKDEP case as well.
> 
> > [...] moreover, completion::map, which used as
> > the parameter of lockdep_init_map_crosslock(), is only defined when
> > CONFIG_LOCKDEP_COMPLETE=y.
> 
> If the !LOCKDEP wrapper is a CPP macro then it can ignore that parameter just 
> fine, and it won't be built.
> 

Oops, I miss this part.. so I will cook a patch define
lockdep_init_map_crosslock() when !LOCKDEP and I think based on that,
there is no need to introducde INIT_WQ_BARRIER_ONSTACK(), we can simply:

	lockdep_init_map_crosslock(...);
	__init_completion();

in insert_wq_barrier(). Simpler.

Thanks for your suggestion.

Regards,
Boqun

> Thanks,
> 
> 	Ingo

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