linux-kernel - Re: [PATCH 4/4] locking: Introduce smp_cond

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Message-ID: <20151104035700.GN29027@linux.vnet.ibm.com>
Date:	Tue, 3 Nov 2015 19:57:00 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	boqun.feng@...il.com, Jonathan Corbet <corbet@....net>,
	Michal Hocko <mhocko@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 4/4] locking: Introduce smp_cond_acquire()

On Tue, Nov 03, 2015 at 11:40:24AM -0800, Linus Torvalds wrote:
> On Mon, Nov 2, 2015 at 5:57 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:

[ . . . ]

> > I am in India and my Alpha Architecture Manual is in the USA.
> 
> I sent you a link to something that should work, and that has the section.

Thank you, and yes, it clearly states that read-to-write dependencies
are ordered.  Color me slow and stupid.

> > And they did post a clarification on the web:
> 
> So for alpha, you trust a random web posting by a unknown person that
> talks about some random problem in an application that we don't even
> know what it is.

In my defense, the Alpha architects pointed me at that web posting, but
yes, it appears to be pushing for overly conservative safety rather than
accuracy.  Please accept my apologies for my confusion.

							Thanx, Paul

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