linux-kernel - [PATCH v1 1/6] mm/rmap: drop stale comment in page_add_anon_rmap and hugepage_add_anon

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230913125113.313322-2-david@redhat.com>
Date:   Wed, 13 Sep 2023 14:51:08 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>
Subject: [PATCH v1 1/6] mm/rmap: drop stale comment in page_add_anon_rmap and hugepage_add_anon_rmap()

That comment was added in commit 5dbe0af47f8a ("mm: fix kernel BUG at
mm/rmap.c:1017!") to document why we can see vma->vm_end getting
adjusted concurrently due to a VMA split.

However, the optimized locking code was changed again in bf181b9f9d8
("mm anon rmap: replace same_anon_vma linked list with an interval tree.").

... and later, the comment was changed in commit 0503ea8f5ba7 ("mm/mmap:
remove __vma_adjust()") to talk about "vma_merge" although the original
issue was with VMA splitting.

Let's just remove that comment. Nowadays, it's outdated, imprecise and
confusing.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/rmap.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index ec7f8e6c9e48..ca2787c1fe05 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1245,7 +1245,6 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
 		__lruvec_stat_mod_folio(folio, NR_ANON_MAPPED, nr);
 
 	if (likely(!folio_test_ksm(folio))) {
-		/* address might be in next vma when migration races vma_merge */
 		if (first)
 			__page_set_anon_rmap(folio, page, vma, address,
 					     !!(flags & RMAP_EXCLUSIVE));
@@ -2536,7 +2535,6 @@ void hugepage_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
 
 	BUG_ON(!folio_test_locked(folio));
 	BUG_ON(!anon_vma);
-	/* address might be in next vma when migration races vma_merge */
 	first = atomic_inc_and_test(&folio->_entire_mapcount);
 	VM_BUG_ON_PAGE(!first && (flags & RMAP_EXCLUSIVE), page);
 	VM_BUG_ON_PAGE(!first && PageAnonExclusive(page), page);
-- 
2.41.0