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| author |   David Hildenbrand <david@redhat.com> | 2025-02-10 20:37:54 +0100 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2025-03-16 22:05:59 -0700 |
| commit | bd1f2b2ace84bac030b70d51710581b48ffdb690 (patch) | |
| tree | 05d198f052ce953fdd1626e0b8f72d72773f0f2b /mm/memory.c | |
| parent | mm/rmap: handle device-exclusive entries correctly in try_to_migrate_one() (diff) | |
| download | wireguard-linux-bd1f2b2ace84bac030b70d51710581b48ffdb690.tar.xz wireguard-linux-bd1f2b2ace84bac030b70d51710581b48ffdb690.zip | |
mm/rmap: handle device-exclusive entries correctly in page_vma_mkclean_one()
Ever since commit b756a3b5e7ea ("mm: device exclusive memory access") we
can return with a device-exclusive entry from page_vma_mapped_walk().
page_vma_mkclean_one() is not prepared for that, so teach it about these
PFN swap PTEs. Note that device-private entries are so far not applicable
on that path, as we expect ZONE_DEVICE pages so far only in migration code
when it comes to the RMAP.
Note that we could currently only run into this case with device-exclusive
entries on THPs. We still adjust the mapcount on conversion to
device-exclusive; this makes the rmap walk abort early for small folios,
because we'll always have !folio_mapped() with a single device-exclusive
entry. We'll adjust the mapcount logic once all page_vma_mapped_walk()
users can properly handle device-exclusive entries.
Link: https://lkml.kernel.org/r/20250210193801.781278-13-david@redhat.com
Fixes: b756a3b5e7ea ("mm: device exclusive memory access")
Signed-off-by: David Hildenbrand <david@redhat.com>
Tested-by: Alistair Popple <apopple@nvidia.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Karol Herbst <kherbst@redhat.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Lyude <lyude@redhat.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Simona Vetter <simona.vetter@ffwll.ch>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yanteng Si <si.yanteng@linux.dev>
Cc: Barry Song <v-songbaohua@oppo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
0 files changed, 0 insertions, 0 deletions