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b=qioR1czQGcX9c+h+SaZCzzuecJqpv1iUe+Wy1oY/3VxML1KS5V64I7t1eBLplWkjS u4BJU5jaHEnsSTAZEW8SnOxVc/e6opmGtxW1UHgLGVRc56yRbftnVNia8L/YWBY5nA 6HNrsUTAIXr6QamBRrt6lItmuXz5pwMUGPvNW7ZFnKGv+B2QZS/B5ZFJWMjPsPjvhw LZkMecpkIRQSrQkpqztZo3CKInSFGkq0DqihmnRf4CtnNjwWewvlKQJxpNPPPNouGc UyyA8w4JvdPwIeDO2H86MjVcP96JzKSLIKv+f3SzwPndD6pKItG0I0Y3dwwOpjaO1o N9D2L714mndNg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 3/5] mm/damon/lru_sort: use damon_kdamond_pid() Date: Thu, 15 Jan 2026 07:20:43 -0800 Message-ID: <20260115152047.68415-4-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: 9f1mr4sdzuyn9w6wk954k4m3p114gf4t X-Rspam-User: X-Rspamd-Queue-Id: 5715A1C000D X-Rspamd-Server: rspam08 X-HE-Tag: 1768490454-799237 X-HE-Meta: U2FsdGVkX1/F/z/+SH7knWnlB31WVbsixJn+GhGQ0saV/w5vBN0QK/HFpW9ZFMR64IAW+kvpJE2t8rNv4jMZqDgct6B0irai0C18kLDV7G//9MMwfv8W7LjtGKARYkaOZYDDfv3d/6VZNhRe1odvXsRiKN2WppTIISKmGIr7vtW7cIGMnUjDC77MoG/8reXhrfnqU8Sg0rZz1+GYkp65eBtpzSjmseh7ZSlZc1q9GMq2ikHM3j7Cn7kOjDRLmvuOAOH/O5E8yJ68vCyUscJt3zo9IXr7+tWEZ2QMwn3Tgz3Ha/DDfimXtN2gAjnG+VWu1dBzmWvwT6ani73XPOY4Oc5yKQf6n2s9QxGYk2ifIqfwzsO+D2LAuG12ozBRrUyuj1EYozIiejZu2zdzdkhA79dIx2n58IHWkL910EcyeIDMQI5nLIZfLq8LyC3j4VEYrxSM9lrdnK+3aaxxJjBDjDtLEdH8LkfyX01p3T31BgPhrfh54Ur+duO4kjrPwRsMBDy+wjlsWy/LuxH9nsXWUoBOTXCc1Ac9tDjK2jQcBljF0x4biA7fDGdCCJPA1h9tS2t8d0Tb2fg8wx7Mkx2sTOS433r1PW/pEYrUeO+Q1cNzUWyECCoivTT6HDkP5IMp/S2hq9SMIUKg9ZeOOQHaSayXMv2XhKssOIA3aawOE5mOcChHCVLVm+TPx+qrOdCnBHHSDDASp4/KNH+51/LKQkVU0XEMpB/ong52i15No5NBzpDkjNBhVLhfBCwlESp4dzyerIuxvAOzDYMSQLHsj3H3URBmmT08QE0v3Jz/EkElBZRjJ32S0J5XrFiTfnoGI8H7SMs49zQ1Gj88BWtS/6oEHQLCQhv5eXXZlf+YhAlKBUGhfzn/0PE7gl274iwX7dkc1ttLBfy901Y1tcx0i8WprBbBG1Sl0hstYdLdX1nPXhZaV33rHFXlEOOc+isnXt1TUhZcYKc/xt+OKIG r1tov05u LdTaweMg+Xkytb2bFmdd5NMYuo35Ics50wDkCI6QEIBWBtIg+x7Hmki43c0qpvChFdI+Nesg3oWFyft3Kp1zTNEmru7491eCP2BWmtVyNJEt81lX5GF0W3Kyr9rRrrCAMgU74qyWtJGRAVGM3tymfwE2cGwjZBfsFOinGLkIIB/YhYFGBhkS/sAnlQgvOPe7giSws6GBitQ7n4b+6EnAiUjaT+Xq48p67CNOy58++OTHEf+w= 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_LRU_SORT 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/lru_sort.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c index 8296f984b428..bedb9134d286 100644 --- a/mm/damon/lru_sort.c +++ b/mm/damon/lru_sort.c @@ -405,7 +405,9 @@ static int damon_lru_sort_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