[merged mm-stable] mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input.patch removed from -mm tree

[merged mm-stable] mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/core: use mult_frac() in damon_feed_loop_next_input()
has been removed from the -mm tree.  Its filename was
     mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input.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: SJ Park <sj@kernel.org>
Subject: mm/damon/core: use mult_frac() in damon_feed_loop_next_input()
Date: Thu, 17 Sep 2026 07:22:01 -0700

damon_feed_loop_next_input() does its best effort overflow protection.
score_goal_diff is always smaller than goal (10,000).  Hence the
calculation can be replaced to use mult_frac() without concerning the
overflow.  Use mult_frac().

Link: https://lore.kernel.org/20260917142210.90829-4-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@davidgow.net>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
---

 mm/damon/core.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/mm/damon/core.c~mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input
+++ a/mm/damon/core.c
@@ -2927,11 +2927,7 @@ static unsigned long damon_feed_loop_nex
 		return min_input;
 
 	score_goal_diff = abs_diff(score, goal);
-
-	if (last_input < ULONG_MAX / score_goal_diff)
-		compensation = last_input * score_goal_diff / goal;
-	else
-		compensation = last_input / goal * score_goal_diff;
+	compensation = mult_frac(last_input, score_goal_diff, goal);
 
 	if (over_achieving)
 		return max(last_input - compensation, min_input);
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-introduce-damos_quota_goal-complement.patch
mm-damon-core-add-complement-argument-to-damos_new_quota_goal.patch
mm-damon-sysfs-schemes-support-quota-goal-complement-flag.patch
mm-damon-tests-core-kunit-test-quota_goal-complement-commit.patch
selftests-damon-sysfssh-test-quota-goal-complement-flag-file.patch
docs-mm-damon-design-document-damos-quota-goal-complement-flag.patch
docs-admin-guide-mm-damon-usage-update-for-quota-goal-complement-file.patch
docs-abi-damon-update-for-quota-goal-metric-complement-sysfs-file.patch