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| author | Andrew Bresticker <abrestic@rivosinc.com> | 2024-06-11 08:32:16 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-06-24 20:52:11 -0700 |
| commit | ab1ffc86cb5bec1c92387b9811d9036512f8f4eb (patch) | |
| tree | bc346066345e174dde4fe767dbc24036efca8d9b /mm | |
| parent | bf14ed81f571f8dba31cd72ab2e50fbcc877cc31 (diff) | |
| download | linux-ab1ffc86cb5bec1c92387b9811d9036512f8f4eb.tar.gz linux-ab1ffc86cb5bec1c92387b9811d9036512f8f4eb.tar.bz2 linux-ab1ffc86cb5bec1c92387b9811d9036512f8f4eb.zip | |
mm/memory: don't require head page for do_set_pmd()
The requirement that the head page be passed to do_set_pmd() was added in
commit ef37b2ea08ac ("mm/memory: page_add_file_rmap() ->
folio_add_file_rmap_[pte|pmd]()") and prevents pmd-mapping in the
finish_fault() and filemap_map_pages() paths if the page to be inserted is
anything but the head page for an otherwise suitable vma and pmd-sized
page.
Matthew said:
: We're going to stop using PMDs to map large folios unless the fault is
: within the first 4KiB of the PMD. No idea how many workloads that
: affects, but it only needs to be backported as far as v6.8, so we may
: as well backport it.
Link: https://lkml.kernel.org/r/20240611153216.2794513-1-abrestic@rivosinc.com
Fixes: ef37b2ea08ac ("mm/memory: page_add_file_rmap() -> folio_add_file_rmap_[pte|pmd]()")
Signed-off-by: Andrew Bresticker <abrestic@rivosinc.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index 25a77c4fe4a0..d10e616d7389 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4608,8 +4608,9 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page) if (!thp_vma_suitable_order(vma, haddr, PMD_ORDER)) return ret; - if (page != &folio->page || folio_order(folio) != HPAGE_PMD_ORDER) + if (folio_order(folio) != HPAGE_PMD_ORDER) return ret; + page = &folio->page; /* * Just backoff if any subpage of a THP is corrupted otherwise |