Commit 9a1c0480 authored Nov 21, 2023 by Alexander Gordeev Committed by Wen Zhiwei Mar 11, 2025

pgtable: fix s390 ptdesc field comments

stable inclusion
from stable-v6.6.72
commit 1abe0a34aea6cf5fd3177e76c3dc85bb7f99f9fc
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IBQN9L

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1abe0a34aea6cf5fd3177e76c3dc85bb7f99f9fc

--------------------------------

[ Upstream commit 38ca8a185389716e9f7566bce4bb0085f71da61d ]

Patch series "minor ptdesc updates", v3.

This patch (of 2):

Since commit d08d4e7cd6bf ("s390/mm: use full 4KB page for 2KB PTE") there
is no fragmented page tracking on s390.  Fix the corresponding comments.

Link: https://lkml.kernel.org/r/cover.1700594815.git.agordeev@linux.ibm.com
Link: https://lkml.kernel.org/r/2eead241f3a45bed26c7911cf66bded1e35670b8.1700594815.git.agordeev@linux.ibm.com


Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 59d9094df3d7 ("mm: hugetlb: independent PMD page table shared count")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Wen Zhiwei <wenzhiwei@kylinos.cn>

parent f9a60d34

include/linux/mm_types.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -440,11 +440,11 @@ 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.
		* @_refcount: Same as page refcount.
		* @pt_memcg_data: Memcg data. Tracked for page tables here.
		*
		* This struct overlays struct page for now. Do not modify without a good