[merged mm-stable] mm-page_alloc-replace-custom-bad-page-ratelimiting-logic.patch removed from -mm tree

[merged mm-stable] mm-page_alloc-replace-custom-bad-page-ratelimiting-logic.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/page_alloc: replace custom bad page ratelimiting logic
has been removed from the -mm tree.  Its filename was
     mm-page_alloc-replace-custom-bad-page-ratelimiting-logic.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Pedro Falcato <pfalcato@suse.de>
Subject: mm/page_alloc: replace custom bad page ratelimiting logic
Date: Tue, 11 Aug 2026 18:21:56 +0100

The current logic (allow up to $BURST prints per minute) can be entirely
replaced by the generic version in lib/ratelimit.c, used around the
kernel.

Do so. The only functional difference should be that the new logs will
read something like:

KERN_WARNING "bad_page: %d callbacks suppressed\n", ...

But that should be fine enough.

Link: https://lore.kernel.org/20260811172156.356053-3-pfalcato@suse.de
Signed-off-by: Pedro Falcato <pfalcato@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: SJ Park <sj@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
---

 mm/page_alloc.c |   28 +++++-----------------------
 1 file changed, 5 insertions(+), 23 deletions(-)

--- a/mm/page_alloc.c~mm-page_alloc-replace-custom-bad-page-ratelimiting-logic
+++ a/mm/page_alloc.c
@@ -613,31 +613,13 @@ static inline bool __maybe_unused bad_ra
 }
 #endif
 
+/* Allow a burst of 60 reports per minute */
+static DEFINE_RATELIMIT_STATE(bad_page_ratelimit, 60 * HZ, 60);
+
 static void bad_page(struct page *page, const char *reason)
 {
-	static unsigned long resume;
-	static unsigned long nr_shown;
-	static unsigned long nr_unshown;
-
-	/*
-	 * Allow a burst of 60 reports, then keep quiet for that minute;
-	 * or allow a steady drip of one report per second.
-	 */
-	if (nr_shown == 60) {
-		if (time_before(jiffies, resume)) {
-			nr_unshown++;
-			goto out;
-		}
-		if (nr_unshown) {
-			pr_alert(
-			      "BUG: Bad page state: %lu messages suppressed\n",
-				nr_unshown);
-			nr_unshown = 0;
-		}
-		nr_shown = 0;
-	}
-	if (nr_shown++ == 0)
-		resume = jiffies + 60 * HZ;
+	if (!__ratelimit(&bad_page_ratelimit))
+		goto out;
 
 	pr_alert("BUG: Bad page state in process %s  pfn:%05lx\n",
 		current->comm, page_to_pfn(page));
_

Patches currently in -mm which might be from pfalcato@suse.de are