linux-kernel - Re: [PATCH] Document that wake_up(), complete() and co. imply a full memory barrier

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Message-ID: <22193.1240519034@redhat.com>
Date:	Thu, 23 Apr 2009 21:37:14 +0100
From:	David Howells <dhowells@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	dhowells@...hat.com, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>, serue@...ibm.com,
	viro@...iv.linux.org.uk,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Document that wake_up(), complete() and co. imply a full memory barrier

Oleg Nesterov <oleg@...hat.com> wrote:

> Well. I think in that case almost every try_to_wake_up/wake_up_process
> needs mb().

Not exactly.  They need smp_wmb() in the wake_up() path - unless they use
locks, which a lot of cases do.

David
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