From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 27 May 2015 01:39:36 +0000 (+0930)
Subject: seqlock: Introduce raw_read_seqcount_latch()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~63^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7fc26327b75685f37f58d64bdb061460f834f80d;p=pandora-kernel.git

seqlock: Introduce raw_read_seqcount_latch()

Because with latches there is a strict data dependency on the seq load
we can avoid the rmb in favour of a read_barrier_depends.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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