+ alloc_tag-avoid-warnings-when-freeing-non-compound-tail-pages.patch added to mm-unstable branch

+ alloc_tag-avoid-warnings-when-freeing-non-compound-tail-pages.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: alloc_tag: avoid warnings when freeing non-compound "tail" pages
has been added to the -mm mm-unstable branch.  Its filename is
     alloc_tag-avoid-warnings-when-freeing-non-compound-tail-pages.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/alloc_tag-avoid-warnings-when-freeing-non-compound-tail-pages.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Suren Baghdasaryan <surenb@google.com>
Subject: alloc_tag: avoid warnings when freeing non-compound "tail" pages
Date: Mon, 15 Sep 2025 14:27:56 -0700

When freeing "tail" pages of a non-compount high-order page, we properly
subtract the allocation tag counters, however later when these pages are
released, alloc_tag_sub() will issue warnings because tags for these pages
are NULL.

This issue was originally anticipated by Vlastimil in his review [1] and
then recently reported by David.  Prevent warnings by marking the tags
empty.

Link: https://lkml.kernel.org/r/20250915212756.3998938-4-surenb@google.com
Link: https://lore.kernel.org/all/6db0f0c8-81cb-4d04-9560-ba73d63db4b8@suse.cz/ [1]
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suggested-by: David Wang <00107082@163.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Usama Arif <usamaarif642@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/mm/page_alloc.c~alloc_tag-avoid-warnings-when-freeing-non-compound-tail-pages
+++ a/mm/page_alloc.c
@@ -5240,9 +5240,16 @@ static void ___free_pages(struct page *p
 		__free_frozen_pages(page, order, fpi_flags);
 	else if (!head) {
 		pgalloc_tag_sub_pages(tag, (1 << order) - 1);
-		while (order-- > 0)
+		while (order-- > 0) {
+			/*
+			 * The "tail" pages of this non-compound high-order
+			 * page will have no code tags, so to avoid warnings
+			 * mark them as empty.
+			 */
+			clear_page_tag_ref(page + (1 << order));
 			__free_frozen_pages(page + (1 << order), order,
 					    fpi_flags);
+		}
 	}
 }
 
_

Patches currently in -mm which might be from surenb@google.com are

alloc_tag-use-release_pages-in-the-cleanup-path.patch
alloc_tag-prevent-enabling-memory-profiling-if-it-was-shut-down.patch
alloc_tag-avoid-warnings-when-freeing-non-compound-tail-pages.patch