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

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Message-ID: <20170302042021.GN16328@bombadil.infradead.org>
Date:   Wed, 1 Mar 2017 20:20:21 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Byungchul Park <byungchul.park@....com>, 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 07:15:47PM +0100, Peter Zijlstra wrote:
> (And we should not be returning to userspace with locks held anyway --
> lockdep already has a check for that).

Don't we return to userspace with page locks held, eg during async directio?