linux-kernel - [PATCH] mm: page_alloc: Use div64_ul() instead of do

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Message-ID: <20240228224911.1164-2-thorsten.blum@toblux.com>
Date: Wed, 28 Feb 2024 23:49:12 +0100
From: Thorsten Blum <thorsten.blum@...lux.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH] mm: page_alloc: Use div64_ul() instead of do_div()

Fixes Coccinelle/coccicheck warning reported by do_div.cocci.

Compared to do_div(), div64_ul() does not implicitly cast the divisor and
does not unnecessarily calculate the remainder.

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 150d4f23b010..dfafec7fba1d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5845,7 +5845,7 @@ static void __setup_per_zone_wmarks(void)
 
 		spin_lock_irqsave(&zone->lock, flags);
 		tmp = (u64)pages_min * zone_managed_pages(zone);
-		do_div(tmp, lowmem_pages);
+		tmp = div64_ul(tmp, lowmem_pages);
 		if (is_highmem(zone) || zone_idx(zone) == ZONE_MOVABLE) {
 			/*
 			 * __GFP_HIGH and PF_MEMALLOC allocations usually don't
-- 
2.44.0