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

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Date:   Thu, 2 Mar 2017 13:45:35 +0900
From:   "byungchul.park" <byungchul.park@....com>
To:     "'Matthew Wilcox'" <willy@...radead.org>,
        "'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

> -----Original Message-----
> From: Matthew Wilcox [mailto:willy@...radead.org]
> Sent: Thursday, March 02, 2017 1:20 PM
> To: Peter Zijlstra
> Cc: Byungchul Park; 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?

Hello,

I think that the check when returning to user with crosslocks held
should be an exception. Don't you think so?

Thanks,
Byungchul