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

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Message-ID: <20170228124906.GC32474@worktop>
Date:   Tue, 28 Feb 2017 13:49:06 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
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
Subject: Re: [PATCH v5 06/13] lockdep: Implement crossrelease feature

On Tue, Feb 28, 2017 at 01:45:07PM +0100, Peter Zijlstra wrote:
> On Wed, Jan 18, 2017 at 10:17:32PM +0900, Byungchul Park wrote:
> > +	/*
> > +	 * struct held_lock does not have an indicator whether in nmi.
> > +	 */
> > +	int nmi;
> 
> Do we really need this? Lockdep doesn't really know about NMI context,
> so its weird to now partially introduce it.

That is, see how nmi_enter() includes lockdep_off().