The patch titled
Subject: mm/memory: don't require head page for do_set_pmd()
has been added to the -mm mm-unstable branch. Its filename is
mm-memory-dont-require-head-page-for-do_set_pmd.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-dont-require-head-page-for-do_set_pmd.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
Subject: mm/memory: don't require head page for do_set_pmd()
Date: Tue, 11 Jun 2024 08:32:16 -0700
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.
Link: https://lkml.kernel.org/r/20240611153216.2794513-1-abrestic@xxxxxxxxxxxx
Fixes: ef37b2ea08ac ("mm/memory: page_add_file_rmap() -> folio_add_file_rmap_[pte|pmd]()")
Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/memory.c~mm-memory-dont-require-head-page-for-do_set_pmd
+++ a/mm/memory.c
@@ -4699,8 +4699,9 @@ vm_fault_t do_set_pmd(struct vm_fault *v
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
_
Patches currently in -mm which might be from abrestic@xxxxxxxxxxxx are
mm-memory-dont-require-head-page-for-do_set_pmd.patch
