From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 27 May 2015 01:39:36 +0000 (+0930)
Subject: rcu: Move lockless_dereference() out of rcupdate.h
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~63^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a04b0166929405cd833c1cc40f99e862b965ddc;p=pandora-kernel.git

rcu: Move lockless_dereference() out of rcupdate.h

I want to use lockless_dereference() from seqlock.h, which would mean
including rcupdate.h from it, however rcupdate.h already includes
seqlock.h.

Avoid this by moving lockless_dereference() into compiler.h. This is
somewhat tricky since it uses smp_read_barrier_depends() which isn't
available there, but its a CPP macro so we can get away with it.

The alternative would be moving it into asm/barrier.h, but that would
be updating each arch (I can do if people feel that is more
appropriate).

Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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