From: Rik van Riel <riel@redhat.com>
Date: Sun, 27 Apr 2014 06:15:35 +0000 (-0700)
Subject: rcu: Provide API to suppress stall warnings while sysrc runs
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~26^2^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61f38db3e3c0e4c3be0858750e2cabeadaecac0c;p=pandora-kernel.git

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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