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b=h5ExFZPJQqiTePp/WDl73sof3pqfsr/hdjFIOJ3lWzZVKGNrtN2V8/Ojg3ODcNRq7 1paKZ44w7an5o/r95vLVQv0bk4qiUZukq79QAXR2ZqdBkofCE0xLAl9TJrzFwtvJcE ijDZn/rSTZtXH+MW1Bw8sNSFaZU7VsiiLNetPjm+IJqzE6WxgjoKHkrTLSE/rm3pXW xZNQB4GzoKlISfZh6wVJLLic5/78/BKiecMDKc6zrvcbYIsEA/EYPmWYxkhH+jgMFs +y2OjyLKNf7NF9FLh586Wz6pPCalP5v6BapcLU3zT4nHbgz4f1xG0lXfaKpNmzQuSp 2Z7RIfsHMLVHQ== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 03/10] mm/damon/core: use mult_frac() in damon_feed_loop_next_input() Date: Thu, 17 Sep 2026 07:22:01 -0700 Message-ID: <20260917142210.90829-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260917142210.90829-1-sj@kernel.org> References: <20260917142210.90829-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 63CF2180009 X-Stat-Signature: pbabgd15pfpo33jjp55fbdep56rjt33k X-HE-Tag: 1789654940-291368 X-HE-Meta: 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 sa9Z3Q+7 AIy1WEBEn/K7BB4aAmkQIs/WUjW+nUymgYAttQrU6kugMN6HG4cUcBjBPqvdPoAPhMGHxfZvJ0jTdsGdTVH2yxIA7RgIb1eRFoLtiyZ14vt4QM/0icXPwY7mRKgPgEVfbGxiyTjhD+zPjID99+x0wTiL9zMXg35zk2NU8SlsVgT0/Dun/yYsDkGSKFDmi+ntETnHyYowqyz1pj8lQblsD4WHvWdYsGBOITTFupzpyBsjU8/uj7BlHhGV7ptI+v8aR3bG3kw13u0ny5789weSXoEATFw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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(). Signed-off-by: SJ Park --- mm/damon/core.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index de46072dc1a2f..bc41ac7ecca43 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2927,11 +2927,7 @@ static unsigned long damon_feed_loop_next_input(unsigned long last_input, 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); -- 2.47.3