The quilt patch titled Subject: mm/memory: don't require head page for do_set_pmd() has been removed from the -mm tree. Its filename was mm-memory-dont-require-head-page-for-do_set_pmd.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------ From: Andrew Bresticker abrestic@rivosinc.com 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.

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 ---

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 @@ -4608,8 +4608,9 @@ 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@rivosinc.com are