From 61f38db3e3c0e4c3be0858750e2cabeadaecac0c Mon Sep 17 00:00:00 2001
From: Rik van Riel <riel@redhat.com>
Date: Sat, 26 Apr 2014 23:15:35 -0700
Subject: [PATCH] rcu: Provide API to suppress stall warnings while sysrc runs

Some sysrq handlers can run for a long time, because they dump a lot
of data onto a serial console. Having RCU stall warnings pop up in
the middle of them only makes the problem worse.

This commit provides rcu_sysrq_start() and rcu_sysrq_end() APIs to
temporarily suppress RCU CPU stall warnings while a sysrq request is
handled.

Signed-off-by: Rik van Riel <riel@redhat.com>
[ paulmck: Fix TINY_RCU build error. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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