From: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Date: Sat, 19 Jul 2025 20:54:00 +0000 (-0400)
Subject: mm: cma: simplify cma_maxchunk_get()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c79147e4b02fa3679aebf34121b12f5097731d8a;p=thirdparty%2Flinux.git

mm: cma: simplify cma_maxchunk_get()

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

Link: https://lkml.kernel.org/r/20250719205401.399475-3-yury.norov@gmail.com
Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index fdf899532ca02..8c7d7f8e8fbd0 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;