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[142.167.56.70]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6fac6e2fc45sm80639296d6.122.2025.06.03.06.35.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Jun 2025 06:35:10 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1uMRnJ-00000001h4R-2OPU; Tue, 03 Jun 2025 10:35:09 -0300 Date: Tue, 3 Jun 2025 10:35:09 -0300 From: Jason Gunthorpe To: Alistair Popple Cc: linux-mm@kvack.org, gerald.schaefer@linux.ibm.com, dan.j.williams@intel.com, willy@infradead.org, david@redhat.com, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, zhang.lyra@gmail.com, debug@rivosinc.com, bjorn@kernel.org, balbirs@nvidia.com, lorenzo.stoakes@oracle.com, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-cxl@vger.kernel.org, dri-devel@lists.freedesktop.org, John@groves.net Subject: Re: [PATCH 02/12] mm: Convert pXd_devmap checks to vma_is_dax Message-ID: <20250603133509.GC386142@ziepe.ca> References: <224f0265027a9578534586fa1f6ed80270aa24d5.1748500293.git-series.apopple@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <224f0265027a9578534586fa1f6ed80270aa24d5.1748500293.git-series.apopple@nvidia.com> X-Rspam-User: X-Rspamd-Queue-Id: 7394318000C X-Rspamd-Server: rspam09 X-Stat-Signature: gcm33umygkki57bh9wkrjjf8px4d9rq3 X-HE-Tag: 1748957711-44238 X-HE-Meta: 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 B0OtzmzE W6U/fYXREY5ApiJTj7KZ8v5oCGW0+PYivDnHHlGyP8nBC6ffsI8giVSzNGbDOgMzvtNm2zzSBGDdeuNfzvY4BAwddf4zOafwEPh9IM9xgxdUA0Djwlh+uM4eujpE6kwyArv6SU1hRc9ky8kRaaOFmvfgM94o32RCwNUNRdbixFWdd6sHMlzXwdu4P9LkN915lv+46ctFq8iHSnbY1+VRcrMHG4pP6TkBk3ttxp5/BSjOBVQt8Ff0743j5zbQSDxu23p9d9OLJPI+lsTHUsK0GJ9rDgLcuNkGXU5OeqlI+SYfop07SrVWlekYdVA95C4dliKPjpzXn9FXZPcq7vlAeOeGlT6ai7ginOMEjhuvi1bQ4oYRtMtcmoD9w0UkV1Bb5tOodImXqm9J2h133qQfmW+1mtEOAw9320iMk3u1byM2szDc= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, May 29, 2025 at 04:32:03PM +1000, Alistair Popple wrote: > Currently dax is the only user of pmd and pud mapped ZONE_DEVICE > pages. Therefore page walkers that want to exclude DAX pages can check > pmd_devmap or pud_devmap. However soon dax will no longer set PFN_DEV, > meaning dax pages are mapped as normal pages. > > Ensure page walkers that currently use pXd_devmap to skip DAX pages > continue to do so by adding explicit checks of the VMA instead. > > Signed-off-by: Alistair Popple > --- > fs/userfaultfd.c | 2 +- > mm/hmm.c | 2 +- > mm/userfaultfd.c | 2 +- > 3 files changed, 3 insertions(+), 3 deletions(-) Reviewed-by: Jason Gunthorpe Jason