From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753542AbdCBEp7 (ORCPT ); Wed, 1 Mar 2017 23:45:59 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:35657 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750734AbdCBEp5 (ORCPT ); Wed, 1 Mar 2017 23:45:57 -0500 Date: Wed, 1 Mar 2017 20:20:21 -0800 From: Matthew Wilcox To: Peter Zijlstra Cc: Byungchul Park , mingo@kernel.org, tglx@linutronix.de, walken@google.com, boqun.feng@gmail.com, kirill@shutemov.name, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, npiggin@gmail.com Subject: Re: [PATCH v5 06/13] lockdep: Implement crossrelease feature Message-ID: <20170302042021.GN16328@bombadil.infradead.org> References: <1484745459-2055-1-git-send-email-byungchul.park@lge.com> <1484745459-2055-7-git-send-email-byungchul.park@lge.com> <20170228181547.GM5680@worktop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170228181547.GM5680@worktop> User-Agent: Mutt/1.7.1 (2016-10-04) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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?