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Wed, 25 Mar 2026 08:38:03 +0100 (CET) From: Josh Law To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Josh Law Subject: [PATCH 2/3] mm/damon/core: use damon_nr_regions() in damon_commit_target_regions() Date: Wed, 25 Mar 2026 07:37:59 +0000 Message-Id: <20260325073800.141756-3-objecting@objecting.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260325073800.141756-1-objecting@objecting.org> References: <20260325073800.141756-1-objecting@objecting.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-ZohoMailClient: External X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 45E8F8000F X-Stat-Signature: tcdokw974e5pwrj8ijqnckt8ssrqtz6r X-Rspam-User: X-HE-Tag: 1774424299-633703 X-HE-Meta: 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 h+3LMogO PFuf5FRAtlQD+RSYeNrCM6exNByIp7I3Nxi5+sDMSPS2XtAY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: damon_commit_target_regions() walks the source region list twice: once to count regions and again to copy their address ranges. Use the already-maintained damon_nr_regions() instead of the counting traversal. Signed-off-by: Josh Law --- mm/damon/core.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 56372e577931..6c1f738e265c 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1217,17 +1217,15 @@ static int damon_commit_target_regions(struct damon_target *dst, { struct damon_region *src_region; struct damon_addr_range *ranges; + unsigned int nr = damon_nr_regions(src); int i = 0, err; - damon_for_each_region(src_region, src) - i++; - if (!i) + if (!nr) return 0; - ranges = kmalloc_objs(*ranges, i, GFP_KERNEL | __GFP_NOWARN); + ranges = kmalloc_objs(*ranges, nr, GFP_KERNEL | __GFP_NOWARN); if (!ranges) return -ENOMEM; - i = 0; damon_for_each_region(src_region, src) ranges[i++] = src_region->ar; err = damon_set_regions(dst, ranges, i, src_min_region_sz); -- 2.34.1