From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-178.mta0.migadu.com (out-178.mta0.migadu.com [91.218.175.178]) (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 311951D54FA for ; Sat, 9 May 2026 09:13:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778317992; cv=none; b=NBZq+ZoB8SqmScuzsawwybZDlO6Qc7FpgLO5jqsiU3jSKYAJhBLvYaOfMkJlB/p91Na/lHt/C41n7K7MyEKJ1gm4wBnO2RYNiyaqdcxT9ErJ7x9OGayVgMdXP/DfOV5wug/hIsetBrbyTrJgJcjLvRu0BcWgevb7/9Q+vj6K3Xk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778317992; c=relaxed/simple; bh=sCg7nnsXGy69X87f/oAcPOYywNmjFFbbTNDYBHqeCXA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=o+O0KAUdlD+0VZUpFjG/X4BFUeiXXz1ME2Bk4xX1oMk64un4m/EsXgehqx3DoAIiDsx/6YRVEkj5g0MOsM5LlLvMKEu8UzRh86nOyXsbtnRP43VC+7eYYpREM9TsuxkgkpOF0wcQq+EaInrhY4ExebyGcTQFR4XbN/KT+yVBhV0= 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=w6+zZKLE; arc=none smtp.client-ip=91.218.175.178 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="w6+zZKLE" 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=1778317979; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=Sm+Ivnv6uC1+wrWYZcZJzFI5gnWxCHEe1mPmLbZSffw=; b=w6+zZKLEid3pNgKj9iyr6JjrFxs0KEO1MFXzHSxVs2oCyK0O8EQJkaNJtWeudtsQzX52M2 61L2L7IQvRj4bMrEoD/ZEAYJQWVPzAsaF9JKnWkxrcItSNY0WSea1gU0pZcnQ4AipwZtPy 0faIZgFH2GA7FELP0Gpe3TUQFLYwy5c= From: Kunwu Chan To: corbet@lwn.net, skhan@linuxfoundation.org Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, paulmck@kernel.org, gustavold@gmail.com, Kunwu Chan Subject: [PATCH] docs: Document panic_on_rcu_stall default behavior Date: Sat, 9 May 2026 17:12:14 +0800 Message-ID: <20260509091214.1679194-1-kunwu.chan@linux.dev> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Kunwu Chan Commit ab875b3e179f ("rcu: Add BOOTPARAM_RCU_STALL_PANIC Kconfig option") made the default value of kernel.panic_on_rcu_stall depend on CONFIG_BOOTPARAM_RCU_STALL_PANIC. Document this in kernel.rst Signed-off-by: Kunwu Chan --- Documentation/admin-guide/sysctl/kernel.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index c6994e55d141..99598a83f830 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -948,6 +948,10 @@ panic_on_rcu_stall When set to 1, calls panic() after RCU stall detection messages. This is useful to define the root cause of RCU stalls using a vmcore. +The default value can be configured at build time via +``CONFIG_BOOTPARAM_RCU_STALL_PANIC``. Runtime updates to this sysctl +always override the built-in default. + = ============================================================ 0 Do not panic() when RCU stall takes place, default behavior. 1 panic() after printing RCU stall messages. -- 2.43.0