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Thu, 5 Feb 2026 09:42:07 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: ATdnKwv6RJ4o Date: Thu, 05 Feb 2026 07:41:11 -0700 From: "Alex Williamson" To: =?UTF-8?Q?Christian_K=C3=B6nig?= , "Jason Gunthorpe" , "Leon Romanovsky" Cc: "Simona Vetter" , "Jani Nikula" , "Lucas De Marchi" , "Sumit Semwal" , "Alex Deucher" , "David Airlie" , "Gerd Hoffmann" , "Dmitry Osipenko" , "Gurchetan Singh" , "Chia-I Wu" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , "Rodrigo Vivi" , "Kevin Tian" , "Joerg Roedel" , "Will Deacon" , "Robin Murphy" , "Felix Kuehling" , "Ankit Agrawal" , "Vivek Kasireddy" , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org Message-Id: <1b7ee5ad-6dde-415a-8e06-93daddc9bcef@app.fastmail.com> In-Reply-To: References: <20260131-dmabuf-revoke-v7-0-463d956bd527@nvidia.com> <20260131-dmabuf-revoke-v7-7-463d956bd527@nvidia.com> <20260204095659.5a983af2@shazbot.org> <20260205121945.GC12824@unreal> <20260205142111.GK2328995@ziepe.ca> Subject: Re: [PATCH v7 7/8] vfio: Permit VFIO to work with pinned importers Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Thu, Feb 5, 2026, at 7:28 AM, Christian K=C3=B6nig wrote: > On 2/5/26 15:21, Jason Gunthorpe wrote: >> On Thu, Feb 05, 2026 at 02:19:45PM +0200, Leon Romanovsky wrote: >>> You don't need any backmerge, SHA-1 version of vfio-v6.19-rc8 tag is= the >>> same as in Linus's tree, so the flow is: >>=20 >> I'm confused what is the problem here? >>=20 >> From https://anongit.freedesktop.org/git/drm/drm-misc >> * branch drm-misc-next -> FETCH_HEAD >>=20 >> $ git show FETCH_HEAD >> commit 779ec12c85c9e4547519e3903a371a3b26a289de >> Author: Alexander Konyukhov >> Date: Tue Feb 3 16:48:46 2026 +0300 >>=20 >> drm/komeda: fix integer overflow in AFBC framebuffer size check >>=20 >> $ git merge-base FETCH_HEAD 61ceaf236115f20f4fdd7cf60f883ada1063349a >> 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7 >> $ git describe --contains 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7 >> v6.19-rc6^0 >>=20 >> $ git log --oneline 61ceaf236115f20f4fdd7cf60f883ada1063349a ^FETCH_H= EAD >> 61ceaf236115f2 vfio: Prevent from pinned DMABUF importers to attach t= o VFIO DMABUF >>=20 >> Just pull Alex's tree, the drm-misc-next tree already has v6.19-rc6, >> so all they will see is one extra patch from Alex in your PR. >>=20 >> No need to backmerge, this is normal git stuff and there won't be >> conflicts when they merge a later Linus tag. > > Correct, but that would merge the same patch through two different=20 > trees. That is usually a pretty big no-go. Applying the patch through two different trees is a no-go, but merging t= he same commit from a shared branch or tag is very common and acceptable= . It's the same commit after all, there is no conflict, no duplicate co= mmit. When the trees are merged, the commit will exist once in the log.= Thanks, Alex