From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yb0-f199.google.com (mail-yb0-f199.google.com [209.85.213.199]) by kanga.kvack.org (Postfix) with ESMTP id 627436B02F9 for ; Wed, 3 Jan 2018 02:06:03 -0500 (EST) Received: by mail-yb0-f199.google.com with SMTP id q204so272358ybg.23 for ; Tue, 02 Jan 2018 23:06:03 -0800 (PST) Received: from imap.thunk.org (imap.thunk.org. [2600:3c02::f03c:91ff:fe96:be03]) by mx.google.com with ESMTPS id w6si103347ywj.232.2018.01.02.23.06.02 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 02 Jan 2018 23:06:02 -0800 (PST) Date: Wed, 3 Jan 2018 02:05:56 -0500 From: Theodore Ts'o Subject: Re: About the try to remove cross-release feature entirely by Ingo Message-ID: <20180103070556.GA22583@thunk.org> References: <20171229014736.GA10341@X58A-UD3R> <20171229035146.GA11757@thunk.org> <20171229072851.GA12235@X58A-UD3R> <20171230061624.GA27959@bombadil.infradead.org> <20171230154041.GB3366@thunk.org> <20171230204417.GF27959@bombadil.infradead.org> <20171230224028.GC3366@thunk.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Byungchul Park Cc: Matthew Wilcox , Byungchul Park , Thomas Gleixner , Peter Zijlstra , Ingo Molnar , david@fromorbit.com, Linus Torvalds , Amir Goldstein , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, oleg@redhat.com, kernel-team@lge.com, daniel@ffwll.ch On Wed, Jan 03, 2018 at 11:10:37AM +0900, Byungchul Park wrote: > > The point I was trying to drive home is that "all we have to do is > > just classify everything well or just invalidate the right lock > > Just to be sure, we don't have to invalidate lock objects at all but > a problematic waiter only. So essentially you are proposing that we have to play "whack-a-mole" as we find false positives, and where we may have to put in ad-hoc plumbing to only invalidate "a problematic waiter" when it's problematic --- or to entirely suppress the problematic waiter altogether. And in that case, a file system developer might be forced to invalidate a lock/"waiter"/"completion" in another subsystem. I will also remind you that doing this will trigger a checkpatch.pl *error*: ERROR("LOCKDEP", "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr); - Ted -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org