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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Sep 17, 2026 at 12:22 PM EDT, Lorenzo Stoakes (ARM) wrote: > GUP cannot be used for VMAs which set VMA_IO_BIT - because memory-mapped > I/O must not be accessed on the user's behalf - or VMA_PFNMAP_BIT - becau= se > PFN maps have no folios which the kernel is permitted to access. > > Rather than keeping these checks open-coded, abstract them to > vma_flags_can_gup() and its VMA wrapper vma_can_gup(). > > A number of other places make the same check to decide whether a mapping > can be populated or accessed as GUP would, so update those too. > > While here, drop a reference to 'special' and replace a use of the > deprecated VMA flags API in vma_dump_size(). > > No functional change intended. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > fs/coredump.c | 4 ++-- > include/linux/mm.h | 29 +++++++++++++++++++++++++++++ > mm/gup.c | 7 +++---- > mm/hmm.c | 3 +-- > mm/memory.c | 14 ++++++++------ > mm/mempolicy.c | 3 ++- > 6 files changed, 45 insertions(+), 15 deletions(-) > Makes sense. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi