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[142.167.56.70]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7d09a0e3fa9sm838696585a.24.2025.06.03.06.48.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Jun 2025 06:48:15 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1uMRzy-00000001hBT-2tOq; Tue, 03 Jun 2025 10:48:14 -0300 Date: Tue, 3 Jun 2025 10:48:14 -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 07/12] mm: Remove redundant pXd_devmap calls Message-ID: <20250603134814.GH386142@ziepe.ca> References: <2ee5a64581d2c78445e5c4180d7eceed085825ca.1748500293.git-series.apopple@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2ee5a64581d2c78445e5c4180d7eceed085825ca.1748500293.git-series.apopple@nvidia.com> On Thu, May 29, 2025 at 04:32:08PM +1000, Alistair Popple wrote: > DAX was the only thing that created pmd_devmap and pud_devmap entries > however it no longer does as DAX pages are now refcounted normally and > pXd_trans_huge() returns true for those. Therefore checking both pXd_devmap > and pXd_trans_huge() is redundant and the former can be removed without > changing behaviour as it will always be false. > > Signed-off-by: Alistair Popple > --- > fs/dax.c | 5 ++--- > include/linux/huge_mm.h | 10 ++++------ > include/linux/pgtable.h | 2 +- > mm/hmm.c | 4 ++-- > mm/huge_memory.c | 30 +++++++++--------------------- > mm/mapping_dirty_helpers.c | 4 ++-- > mm/memory.c | 15 ++++++--------- > mm/migrate_device.c | 2 +- > mm/mprotect.c | 2 +- > mm/mremap.c | 5 ++--- > mm/page_vma_mapped.c | 5 ++--- > mm/pagewalk.c | 8 +++----- > mm/pgtable-generic.c | 7 +++---- > mm/userfaultfd.c | 4 ++-- > mm/vmscan.c | 3 --- > 15 files changed, 40 insertions(+), 66 deletions(-) Reviewed-by: Jason Gunthorpe Jason