mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-03 15:47:36 +00:00
Code Issues Releases Wiki Activity

fs/proc/task_mmu: convert pagemap_hugetlb_range() to work on folios

Browse source 
Patch series "fs/proc/task_mmu: convert hugetlb functions to work on folis".

Let's convert two more functions, getting rid of two more page_mapcount()
calls.


This patch (of 2):

Let's get rid of another page_mapcount() check and simply use
folio_likely_mapped_shared(), which is precise for hugetlb folios.

While at it, also check for PMD table sharing, like we do in
smaps_hugetlb_range().

No functional change intended, except that we would now detect hugetlb
folios shared via PMD table sharing correctly.

Link: https://lkml.kernel.org/r/20240417092313.753919-1-david@redhat.com
Link: https://lkml.kernel.org/r/20240417092313.753919-2-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2024-04-17 11:23:12 +02:00 committed by Andrew Morton
parent 122ff80e12
commit 88e4e47c12
1 changed files with 4 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
fs/proc/task_mmu.c
View file

@ -1578,12 +1578,13 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
pte = huge_ptep_get(ptep);
if (pte_present(pte)) {
struct page *page = pte_page(pte);
struct folio *folio = page_folio(pte_page(pte));
if (!PageAnon(page))
if (!folio_test_anon(folio))
flags |= PM_FILE;
if (page_mapcount(page) == 1)
if (!folio_likely_mapped_shared(folio) &&
!hugetlb_pmd_shared(ptep))
flags |= PM_MMAP_EXCLUSIVE;
if (huge_pte_uffd_wp(pte))