linux-kernel - [PATCH 2/2] mm: cma: simplify cma_maxchunk

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Message-ID: <20250719205401.399475-3-yury.norov@gmail.com>
Date: Sat, 19 Jul 2025 16:54:00 -0400
From: Yury Norov <yury.norov@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>
Subject: [PATCH 2/2] mm: cma: simplify cma_maxchunk_get()

From: Yury Norov (NVIDIA) <yury.norov@...il.com>

The function opencodes for_each_clear_bitrange(). Fix that and drop most
of housekeeping code.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>
---
 mm/cma_debug.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index fdf899532ca0..8c7d7f8e8fbd 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -56,16 +56,8 @@ static int cma_maxchunk_get(void *data, u64 *val)
 	for (r = 0; r < cma->nranges; r++) {
 		cmr = &cma->ranges[r];
 		bitmap_maxno = cma_bitmap_maxno(cma, cmr);
-		end = 0;
-		for (;;) {
-			start = find_next_zero_bit(cmr->bitmap,
-						   bitmap_maxno, end);
-			if (start >= bitmap_maxno)
-				break;
-			end = find_next_bit(cmr->bitmap, bitmap_maxno,
-					    start);
+		for_each_clear_bitrange(start, end, cmr->bitmap, bitmap_maxno)
 			maxchunk = max(end - start, maxchunk);
-		}
 	}
 	spin_unlock_irq(&cma->lock);
 	*val = (u64)maxchunk << cma->order_per_bit;
-- 
2.43.0