Since commit d08d4e7cd6bf ("s390/mm: use full 4KB page for 2KB PTE")
_refcount field is not used for fragmented page tracking on s390 and
there is no other code left that accesses this field explicitly.
Suggested-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
---
include/linux/mm_types.h | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 957ce38768b2..ce0cfc6e4d94 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -401,11 +401,11 @@ FOLIO_MATCH(compound_head, _head_2a);
* @pmd_huge_pte: Protected by ptdesc->ptl, used for THPs.
* @__page_mapping: Aliases with page->mapping. Unused for page tables.
* @pt_mm: Used for x86 pgds.
- * @pt_frag_refcount: For fragmented page table tracking. Powerpc and s390 only.
+ * @pt_frag_refcount: For fragmented page table tracking. Powerpc only.
* @_pt_pad_2: Padding to ensure proper alignment.
* @ptl: Lock for the page table.
* @__page_type: Same as page->page_type. Unused for page tables.
- * @_refcount: Same as page refcount. Used for s390 page tables.
+ * @_pt_pad_3: Padding that aliases with page's refcount.
* @pt_memcg_data: Memcg data. Tracked for page tables here.
*
* This struct overlays struct page for now. Do not modify without a good
@@ -438,7 +438,7 @@ struct ptdesc {
#endif
};
unsigned int __page_type;
- atomic_t _refcount;
+ unsigned int _pt_pad_3;
#ifdef CONFIG_MEMCG
unsigned long pt_memcg_data;
#endif
@@ -452,7 +452,6 @@ TABLE_MATCH(compound_head, _pt_pad_1);
TABLE_MATCH(mapping, __page_mapping);
TABLE_MATCH(rcu_head, pt_rcu_head);
TABLE_MATCH(page_type, __page_type);
-TABLE_MATCH(_refcount, _refcount);
#ifdef CONFIG_MEMCG
TABLE_MATCH(memcg_data, pt_memcg_data);
#endif
--
2.39.2
