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 - because > 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) <[email protected]> > --- > 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 <[email protected]> -- Best Regards, Yan, Zi
