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mm/memory: don't require head page for do_set_pmd()

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BugLink: https://bugs.launchpad.net/bugs/2076435

commit ab1ffc86cb5bec1c92387b9811d9036512f8f4eb upstream.

The requirement that the head page be passed to do_set_pmd() was added in
commit ef37b2ea08 ("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: ef37b2ea08 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Andrew Bresticker
2024-06-11 08:32:16 -07:00
committed by Stefan Bader
parent fac38d25b5
commit 3e8a2bea73
1 changed files with 2 additions and 1 deletions
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mm/memory.c
+2 -1
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@@ -4449,8 +4449,9 @@ 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