linux-kernel - [PATCH] mm/page_alloc: simplify lowmem

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Message-ID: <20250814090053.22241-1-ye.liu@linux.dev>
Date: Thu, 14 Aug 2025 17:00:52 +0800
From: Ye Liu <ye.liu@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>
Cc: Ye Liu <liuye@...inos.cn>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Brendan Jackman <jackmanb@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Zi Yan <ziy@...dia.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/page_alloc: simplify lowmem_reserve max calculation

From: Ye Liu <liuye@...inos.cn>

Use max() macro to simplify the calculation of maximum lowmem_reserve
value in calculate_totalreserve_pages(), instead of open-coding the
comparison. The functionality remains identical.

Signed-off-by: Ye Liu <liuye@...inos.cn>
---
 mm/page_alloc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 64872214bc7d..8a55a4951d19 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6236,8 +6236,7 @@ static void calculate_totalreserve_pages(void)
 
 			/* Find valid and maximum lowmem_reserve in the zone */
 			for (j = i; j < MAX_NR_ZONES; j++) {
-				if (zone->lowmem_reserve[j] > max)
-					max = zone->lowmem_reserve[j];
+				max = max(max, zone->lowmem_reserve[j]);
 			}
 
 			/* we treat the high watermark as reserved pages. */
-- 
2.43.0