From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (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 B12293FE652 for ; Thu, 30 Apr 2026 08:46:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.189 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777538768; cv=none; b=rGf/Vu8kK7IBQ+LFCPTKAqH4NkLmpceI4UiEhHJDO4tTejUCmF4PipPeu3aarHcdkKMTHWgTHKSjNTQWjyuh60lHEq0U/I5OTJSyJGUfLIeIRfAnXlN5VSmDtFPaLlgj7ZkNof1PhU/DSxdnG5wjo7tYmGhbfkE3ewdK6Txs9+0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777538768; c=relaxed/simple; bh=XG1JpCj1PVjtKlFUM+aogmb5LHzlS6tTL7popB9zMdk=; h=From:To:Cc:Subject:Date:Message-Id; b=rp1651yxJ23kRoc3ZYp6KkkNr8Alpr29ELGANN2in5rZJkNDAkGk/5nw3kZYYCp87P9khRO/Nfc3C5amffsX8uLJYmwL5uZEqyaEIym3dhpD+g8ejDNY58/whgZUJBrMe8RUky0LnlOr/B5dgCFwq2sBbKqL7WIbhU7c5PBFm1I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=OHzHfqPV; arc=none smtp.client-ip=95.215.58.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="OHzHfqPV" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1777538754; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc; bh=LZPC9sO3rCTy4EKRx4TxyKwcU3j58hdJZ1FAznjk8mY=; b=OHzHfqPVp7JqOOjX0qnsFEIzfaEx8yICDnmTObfni4ZRwmAnkh4HFs3aFMFK17jQHPnWMp ngapj84poBBu6q5IasBHjTrWKK5MltZwheOqWywSr3+pB5DqWkvansgSUu82EsHppgI5tE jepv+hvfxhIKbYlT2GiWmyQLHL5ISIk= From: Zqiang To: tj@kernel.org, void@manifault.com, arighi@nvidia.com, changwoo@igalia.com Cc: sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, qiang.zhang@linux.dev Subject: [PATCH] sched_ext: Remove redundant rcu_read_lock/unlock() in sysrq_handle_sched_ext_reset() Date: Thu, 30 Apr 2026 16:45:43 +0800 Message-Id: <20260430084543.25137-1-qiang.zhang@linux.dev> X-Migadu-Flow: FLOW_OUT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The sysrq_handle_sched_ext_reset() callback has already been executed in the rcu read critical section within __handle_sysrq(), this commit therefore remove redundant rcu_read_lock/unlock() in the sysrq_handle_sched_ext_reset(). Signed-off-by: Zqiang --- kernel/sched/ext.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 45a2668284bc..0f3e9d088151 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -7953,13 +7953,11 @@ static void sysrq_handle_sched_ext_reset(u8 key) { struct scx_sched *sch; - rcu_read_lock(); sch = rcu_dereference(scx_root); if (likely(sch)) scx_disable(sch, SCX_EXIT_SYSRQ); else pr_info("sched_ext: BPF schedulers not loaded\n"); - rcu_read_unlock(); } static const struct sysrq_key_op sysrq_sched_ext_reset_op = { -- 2.17.1