linux-kernel - Re: [patch][rfc] rwsem: generic rwsem

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Date:	Fri, 08 Dec 2006 13:58:42 +0000
From:	David Howells <dhowells@...hat.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	David Howells <dhowells@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [patch][rfc] rwsem: generic rwsem 

Nick Piggin <npiggin@...e.de> wrote:

> > Look at how the counter works in the XADD-based version.  That's the way
> > it is *because* I'm using XADD.  That's quite limiting.
> 
> Not really. ll/sc architectures "emulate" xadd the same as they would
> emulate a spinlock. There is nothing suboptimal about it.

Yes, really.  You've missed the point entirely.  Look at *how* the counter
*works*.

David
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