From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 484FCDF59; Mon, 22 Sep 2025 01:32:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758504768; cv=none; b=MR/9q7v5Cm/MaqmqxeRMqtRL11ykF0WSfHJ43SX16YTJ9ogOwxtRhw+OSMKVnydNR12ihBtaiW2utQToiH1XSVqI4iutg2BnGKQDG/QuHjIAzo6RjAH9F/ypQlrLny+rAUlG2fCFCdPDSGHTKSxfYWCtj/+Ek5haZQS3PbIyZVk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758504768; c=relaxed/simple; bh=uxjzFijAGUqRJoJXtzBFbfoa3JxlkIJaaNsClV+5oUM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ljn04MMZlcIXAkNshDSQNjrqYjVZZ/OurEbq9P9viQW3Mb5qaSVgLtSDKbFga6YZ6FG4Y9Qelj0+tfIkfeYmgNsC7O+cvwDk/iQz19lPuVkkOzXtkBiFxTbMHfnwnk6tezVBZFKYTDPn0iYIlp8QYKC8o1pTY9qqSHkumpv0hqU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=c8e5Ejvt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="c8e5Ejvt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A846DC4CEE7; Mon, 22 Sep 2025 01:32:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758504767; bh=uxjzFijAGUqRJoJXtzBFbfoa3JxlkIJaaNsClV+5oUM=; h=From:To:Cc:Subject:Date:From; b=c8e5EjvtNHOttZJGdG4m7ixWYvMqWXPjJydQyusD3JW7JWxb5GV9biTaL3RC+zlAB RJaITzxuVmuUfDMe24GDKUTVxV7jPsH9JcsYhdf9fxooov/Nn/nNwYWMqPbZl1j2gA T/JwrpJ/p5dkvH82i6qb6zNdH55EAasr5K9d4jJoSadbnLjDHQzZUP85KPhJJDnRAf FuLNSad809mtmnOcinUkF5hje3hAxsVgXgZNpN9lwixFaisdw28VSz6tA0JXKJDU8L 1rL/0xoGcai4KpX9vuPQ240xvbRlxv2iMvfE9tvfPEXOfnnK253gpInpLRaVe/vg9y eiPTCGDge5aEw== From: Tejun Heo To: David Vernet , Andrea Righi , Changwoo Min Cc: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev, Tejun Heo Subject: [PATCH 1/7] sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast() Date: Sun, 21 Sep 2025 15:32:40 -1000 Message-ID: <20250922013246.275031-1-tj@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The find_user_dsq() function is called from contexts that are already under RCU read lock protection. Switch from rhashtable_lookup_fast() to rhashtable_lookup() to avoid redundant RCU locking. Signed-off-by: Tejun Heo --- kernel/sched/ext.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index f5873f8ed669..df433f6fab4b 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -207,7 +207,7 @@ static struct scx_dispatch_q *find_global_dsq(struct task_struct *p) static struct scx_dispatch_q *find_user_dsq(struct scx_sched *sch, u64 dsq_id) { - return rhashtable_lookup_fast(&sch->dsq_hash, &dsq_id, dsq_hash_params); + return rhashtable_lookup(&sch->dsq_hash, &dsq_id, dsq_hash_params); } /* -- 2.51.0