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b=auUbi4LZbcZY3XoZTmiuEBz9GFhg0i5IAadPhW3u5NPpvll+nU3nybYQhPjICRqrz vIEAcLAnh+2xP+WIYwOc9F9r9eWVTY0Q6hZiR7MCIk9KyFf0AAX5/BmP4OihheV/Ge JOWuHkr0tr8+AFb0hZYuKrBdyRiaSeR8HCrC9QJZQDDu7kK97Xe2cFgDe/bLc9AllJ eqsZvxCYVxF8yaeHoF9eWXr6JotDIzOVgpoZSJOZq1gQdX5SmSVgWBFgHAGYDTbGoB ksMlUXisqACVLlpzTEjbBMoZtFZIiTus8BEpVaCuBCeX1Qq6zyMkAkt+aJTovh2tXj vVywYGXmuu72w== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/5] mm/damon/reclaim: use damon_kdamond_pid() Date: Thu, 15 Jan 2026 07:20:44 -0800 Message-ID: <20260115152047.68415-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260115152047.68415-1-sj@kernel.org> References: <20260115152047.68415-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 4pjeyffmwtp8acrmzcdmbokor1gxn51i X-Rspamd-Queue-Id: 006DFC000C X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1768490454-457364 X-HE-Meta: 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 myY7jX2/ YdregJc0bbLVon/DW94rsgdI3TVyNGShmV7dlsvL1j2XEvSDJop6Dx3KhTZ9CEbNYaexGBnguF4foxLYcWOEVaHsI11Lp9F/rpaejsdAxeC5qlWaytd6BqOqOZsxFJG6dfMCJg5Fazyf9tQsQyd3mxAbk9hVsquS3sT1FQSanilJ1G+N4p/11yOqnNfslPtkkFaAwuZlKYmbDdfGGGhanlYjpKylVr29n9genGJCo49rWYXg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: DAMON_RECLAIM directly uses damon_ctx->kdamond field with manual synchronization using damon_ctx->kdamond_lock, to get the pid of the kdamond. Use a new dedicated function for the purpose, namely damon_kdamond_pid(), since that doesn't require manual and error-prone synchronization. Signed-off-by: SeongJae Park --- mm/damon/reclaim.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 8463a5a5032f..55df43e241c5 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -307,7 +307,9 @@ static int damon_reclaim_turn(bool on) err = damon_start(&ctx, 1, true); if (err) return err; - kdamond_pid = ctx->kdamond->pid; + kdamond_pid = damon_kdamond_pid(ctx); + if (kdamond_pid < 0) + return kdamond_pid; return damon_call(ctx, &call_control); } -- 2.47.3