From 22beb471b46a1a408720498f7895232edab559d1 Mon Sep 17 00:00:00 2001 From: Qi Zheng Date: Mon, 4 Mar 2024 19:07:18 +0800 Subject: [PATCH] mm: pgtable: correct the wrong comment about ptdesc->__page_flags Patch series "minor fixes and supplement for ptdesc". In this series, the [PATCH 1/3] and [PATCH 2/3] are fixes for some issues discovered during code inspection. The [PATCH 3/3] is a supplement to ptdesc conversion in s390, I don't know why this is not done in the commit 6326c26c1514 ("s390: convert various pgalloc functions to use ptdescs"), maybe I missed something. And since I don't have an s390 environment, I hope kernel test robot can help compile and test, and this is why I did not fold [PATCH 2/3] and [PATCH 3/3] into one patch. This patch (of 3): The commit 32cc0b7c9d50 ("powerpc: add pte_free_defer() for pgtables sharing page") introduced the use of PageActive flag to page table fragments tracking, so the ptdesc->__page_flags is not unused, so correct the wrong comment. Link: https://lkml.kernel.org/r/cover.1709541697.git.zhengqi.arch@bytedance.com Link: https://lkml.kernel.org/r/cc42d5915fd98fd802f920de243f535efcfe01db.1709541697.git.zhengqi.arch@bytedance.com Signed-off-by: Qi Zheng Cc: David Hildenbrand Cc: Hugh Dickins Cc: Matthew Wilcox (Oracle) Cc: Mike Rapoport (IBM) Cc: Muchun Song Cc: Vishal Moola (Oracle) Cc: Christian Borntraeger Cc: Claudio Imbrenda Cc: Janosch Frank Signed-off-by: Andrew Morton --- include/linux/mm_types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index a7223ba3ea1e..5ea77969daae 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -419,7 +419,7 @@ FOLIO_MATCH(compound_head, _head_2a); /** * struct ptdesc - Memory descriptor for page tables. - * @__page_flags: Same as page flags. Unused for page tables. + * @__page_flags: Same as page flags. Powerpc only. * @pt_rcu_head: For freeing page table pages. * @pt_list: List of used page tables. Used for s390 and x86. * @_pt_pad_1: Padding that aliases with page's compound head. -- 2.20.1