From: Eric Dumazet <edumazet@google.com>
Date: Wed, 16 Apr 2014 16:06:24 +0000 (-0700)
Subject: softirq: A single rcu_bh_qs() call per softirq set is enough
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~26^2^2~2^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a5d6d3a1b00a0ad88f07c3a727c79b27915278e3;p=pandora-kernel.git

softirq: A single rcu_bh_qs() call per softirq set is enough

Calling rcu_bh_qs() after every softirq action is not really needed.
What RCU needs is at least one rcu_bh_qs() per softirq round to note a
quiescent state was passed for rcu_bh.

Note for Paul and myself : this could be inlined as a single instruction
and avoid smp_processor_id()
(sone this_cpu_write(rcu_bh_data.passed_quiesce, 1))

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---

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