Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19;
From:   Joel Savitz <jsavitz@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Joel Savitz <jsavitz@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        Huang Ying <ying.huang@intel.com>,
        Eric Biggers <ebiggers@google.com>,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Rob Herring <robh@kernel.org>, Wang Qing <wangqing@vivo.com>,
        linux-doc@vger.kernel.org
Subject: [PATCH] Documentation/sysctl: document max_rcu_stall_to_panic
Date:   Thu, 24 Mar 2022 18:11:56 -0400
Message-Id: <20220324221156.44813-1-jsavitz@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

commit dfe564045c65 ("rcu: Panic after fixed number of stalls")
introduced a new systctl but no accompanying documentation.

Add a simple entry to the documentation.

Signed-off-by: Joel Savitz <jsavitz@redhat.com>
---
 Documentation/admin-guide/sysctl/kernel.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 803c60bf21d3..4e48139b9a34 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -781,6 +781,13 @@ is useful to define the root cause of RCU stalls using a vmcore.
 1 panic() after printing RCU stall messages.
 = ============================================================
 
+max_rcu_stall_to_panic
+======================
+
+When ``panic_on_rcu_stall`` is set to 1, this value determines the
+number of times that RCU can stall before panic() is called.
+
+When ``panic_on_rcu_stall`` is set to 0, this value is has no effect.
 
 perf_cpu_time_max_percent
 =========================
-- 
2.27.0