linux-kernel - Re: Linux 3.19-rc3

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Message-ID: <20150106114842.GP10476@twins.programming.kicks-ass.net>
Date:	Tue, 6 Jan 2015 12:48:42 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	Sedat Dilek <sedat.dilek@...il.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Chris Mason <clm@...com>
Subject: Re: Linux 3.19-rc3



Looking at that closure stuff, why is there an smp_mb() in
closure_wake_up() ? Typically wakeup only needs to imply a wmb.

Also note that __closure_wake_up() starts with a fully serializing
instruction (xchg) and thereby already implies the full barrier.


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