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

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Message-ID: <20170817081224.yp3qhqt6vijzvvpz@gmail.com>
Date:   Thu, 17 Aug 2017 10:12:24 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
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


* 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.

Thanks,

	Ingo