From: Barry Song <v-songbaohua@xxxxxxxx>
The folio_test_anon(folio)==false cases has been relocated to
folio_add_new_anon_rmap(). Additionally, four other callers
consistently pass anonymous folios.
stack 1:
remove_migration_pmd
-> folio_add_anon_rmap_pmd
-> __folio_add_anon_rmap
stack 2:
__split_huge_pmd_locked
-> folio_add_anon_rmap_ptes
-> __folio_add_anon_rmap
stack 3:
remove_migration_pmd
-> folio_add_anon_rmap_pmd
-> __folio_add_anon_rmap (RMAP_LEVEL_PMD)
stack 4:
try_to_merge_one_page
-> replace_page
-> folio_add_anon_rmap_pte
-> __folio_add_anon_rmap
__folio_add_anon_rmap() only needs to handle the cases
folio_test_anon(folio)==true now.
We can remove the !folio_test_anon(folio)) path within
__folio_add_anon_rmap() now.
Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx>
Tested-by: Shuai Yuan <yuanshuai@xxxxxxxx>
---
mm/rmap.c | 17 +++--------------
1 file changed, 3 insertions(+), 14 deletions(-)
diff --git a/mm/rmap.c b/mm/rmap.c
index 2b19bb92eda5..ddcdda752982 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1297,23 +1297,12 @@ static __always_inline void __folio_add_anon_rmap(struct folio *folio,
{
int i, nr, nr_pmdmapped = 0;
+ VM_WARN_ON_FOLIO(!folio_test_anon(folio), folio);
+
nr = __folio_add_rmap(folio, page, nr_pages, level, &nr_pmdmapped);
- if (unlikely(!folio_test_anon(folio))) {
- VM_WARN_ON_FOLIO(!folio_test_locked(folio), folio);
- /*
- * For a PTE-mapped large folio, we only know that the single
- * PTE is exclusive. Further, __folio_set_anon() might not get
- * folio->index right when not given the address of the head
- * page.
- */
- VM_WARN_ON_FOLIO(folio_test_large(folio) &&
- level != RMAP_LEVEL_PMD, folio);
- __folio_set_anon(folio, vma, address,
- !!(flags & RMAP_EXCLUSIVE));
- } else if (likely(!folio_test_ksm(folio))) {
+ if (likely(!folio_test_ksm(folio)))
__page_check_anon_rmap(folio, page, vma, address);
- }
__folio_mod_stat(folio, nr, nr_pmdmapped);
--
2.34.1
