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Message-ID: <20250603134814.GH386142@ziepe.ca> Date: Tue, 3 Jun 2025 10:48:14 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Alistair Popple <apopple@...dia.com> Cc: linux-mm@...ck.org, gerald.schaefer@...ux.ibm.com, dan.j.williams@...el.com, willy@...radead.org, david@...hat.com, linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, jhubbard@...dia.com, hch@....de, zhang.lyra@...il.com, debug@...osinc.com, bjorn@...nel.org, balbirs@...dia.com, lorenzo.stoakes@...cle.com, linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, linux-cxl@...r.kernel.org, dri-devel@...ts.freedesktop.org, John@...ves.net Subject: Re: [PATCH 07/12] mm: Remove redundant pXd_devmap calls 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 <apopple@...dia.com> > --- > 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 <jgg@...dia.com> Jason
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