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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> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <224f0265027a9578534586fa1f6ed80270aa24d5.1748500293.git-series.apopple@nvidia.com> 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