From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: MIME-Version: 1.0 References: <20190626122724.13313-1-hch@lst.de> <20190626122724.13313-17-hch@lst.de> <20190628153827.GA5373@mellanox.com> <20190628170219.GA3608@mellanox.com> <20190628182922.GA15242@mellanox.com> In-Reply-To: <20190628182922.GA15242@mellanox.com> From: Dan Williams Date: Fri, 28 Jun 2019 11:44:35 -0700 Message-ID: Subject: Re: [PATCH 16/25] device-dax: use the dev_pagemap internal refcount Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-mm@kvack.org To: Jason Gunthorpe Cc: Christoph Hellwig , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Ben Skeggs , "linux-mm@kvack.org" , "nouveau@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , "linux-nvdimm@lists.01.org" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Andrew Morton List-ID: On Fri, Jun 28, 2019 at 11:29 AM Jason Gunthorpe wrote: > > On Fri, Jun 28, 2019 at 10:10:12AM -0700, Dan Williams wrote: > > On Fri, Jun 28, 2019 at 10:08 AM Dan Williams wrote: > > > > > > On Fri, Jun 28, 2019 at 10:02 AM Jason Gunthorpe wrote: > > > > > > > > On Fri, Jun 28, 2019 at 09:27:44AM -0700, Dan Williams wrote: > > > > > On Fri, Jun 28, 2019 at 8:39 AM Jason Gunthorpe wrote: > > > > > > > > > > > > On Wed, Jun 26, 2019 at 02:27:15PM +0200, Christoph Hellwig wrote: > > > > > > > The functionality is identical to the one currently open coded in > > > > > > > device-dax. > > > > > > > > > > > > > > Signed-off-by: Christoph Hellwig > > > > > > > Reviewed-by: Ira Weiny > > > > > > > drivers/dax/dax-private.h | 4 ---- > > > > > > > drivers/dax/device.c | 43 --------------------------------------- > > > > > > > 2 files changed, 47 deletions(-) > > > > > > > > > > > > DanW: I think this series has reached enough review, did you want > > > > > > to ack/test any further? > > > > > > > > > > > > This needs to land in hmm.git soon to make the merge window. > > > > > > > > > > I was awaiting a decision about resolving the collision with Ira's > > > > > patch before testing the final result again [1]. You can go ahead and > > > > > add my reviewed-by for the series, but my tested-by should be on the > > > > > final state of the series. > > > > > > > > The conflict looks OK to me, I think we can let Andrew and Linus > > > > resolve it. > > > > > > Andrew's tree effectively always rebases since it's a quilt series. > > > I'd recommend pulling Ira's patch out of -mm and applying it with the > > > rest of hmm reworks. Any other git tree I'd agree with just doing the > > > late conflict resolution, but I'm not clear on what's the best > > > practice when conflicting with -mm. > > What happens depends on timing as things arrive to Linus. I promised > to send hmm.git early, so I understand that Andrew will quilt rebase > his tree to Linus's and fix the conflict in Ira's patch before he > sends it. > > > Regardless the patch is buggy. If you want to do the conflict > > resolution it should be because the DEVICE_PUBLIC removal effectively > > does the same fix otherwise we're knowingly leaving a broken point in > > the history. > > I'm not sure I understand your concern, is there something wrong with > CH's series as it stands? hmm is a non-rebasing git tree, so as long > as the series is correct *when I apply it* there is no broken history. > > I assumed the conflict resolution for Ira's patch was to simply take > the deletion of the if block from CH's series - right? > > If we do need to take Ira's patch into hmm.git it will go after CH's > series (and Ira will have to rebase/repost it), so I think there is > nothing to do at this moment - unless you are saying there is a > problem with the series in CH's git tree? There is a problem with the series in CH's tree. It removes the ->page_free() callback from the release_pages() path because it goes too far and removes the put_devmap_managed_page() call.