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 AE7A11E47CA; Sat, 20 Sep 2025 00:59:35 +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=1758329975; cv=none; b=T/6GHi3fOLpfj13Gi+54AOh98PU9sQSCTsPUj3LFNlNEkt3jwLymziRsHAVV83FU0fMKUwfug5QrwcwxMJozyaG7RMbJaGDBjBBEPZPS7cS5meaztm07eYQvBnszGuhVewarsEnSPt3DMtVB1O3ymtObSK+fEJVZ/CpNvMyj0/w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758329975; c=relaxed/simple; bh=uxjzFijAGUqRJoJXtzBFbfoa3JxlkIJaaNsClV+5oUM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Mp/g2LZAlvJx1lnspi7FZJaPEFNqJvJ1wOwe79pHRYhhpIZf6ANrzeUKgq5VOfGzgJK9+7hp5c46c/2SGmrP+Z4LdxiTYGz2Cv+wLX8pKNEEgJ2d1H9AJFiAtnNfIsBBeIHGE8qCQ8uCf83S/M09sHI6bcjgsVX8oYhfMnNq3vY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ovwSs220; 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="ovwSs220" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E6C9C4CEF0; Sat, 20 Sep 2025 00:59:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758329975; bh=uxjzFijAGUqRJoJXtzBFbfoa3JxlkIJaaNsClV+5oUM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ovwSs220cwaf1Eysgh+7ibAfmk4j7Fr9TxxBn+uoJEFVcete2buaB9MKeJLhF3AQT n7rfj7lYn24ipMJbmckDDJNyX9BpJR6jyiToz0+cWyOqfqJVptMm+kbpxbAfg/BPYO 8hARG2kQ6gDvxBAe9pBbQ9qx7CV7Bl7YsUJryMDwodhwjaHyWWcLrnVYyFTYV64QSk EA212+shlNAUnzphpwl22+BEC6/7mBbGrJC6PRPs8/DFmfxQ4JxZY7XC2Zuyqawfax qX3ePEKxqEPmSAY4CYVCsOiJB6OXFrXYzc9vBzIN0/OdAPRbjvmmsjO1Q9LczXDHCn +mJGI/wjODD2w== From: Tejun Heo To: void@manifault.com, arighi@nvidia.com, multics69@gmail.com Cc: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev, memxor@gmail.com, bpf@vger.kernel.org, Tejun Heo Subject: [PATCH 01/46] sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast() Date: Fri, 19 Sep 2025 14:58:24 -1000 Message-ID: <20250920005931.2753828-2-tj@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250920005931.2753828-1-tj@kernel.org> References: <20250920005931.2753828-1-tj@kernel.org> 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