linux-kernel - Re: [PATCH] Replace completions with semaphores

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Message-ID: <20080416100849.01a742aa@laptopd505.fenrus.org>
Date:	Wed, 16 Apr 2008 10:08:49 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Ingo Oeser <ioe-lkml@...eria.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Bart Van Assche <bart.vanassche@...il.com>,
	Roland Dreier <rdreier@...co.com>, Ingo Molnar <mingo@...e.hu>,
	Daniel Walker <dwalker@...sta.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Replace completions with semaphores

On Wed, 16 Apr 2008 10:58:11 -0600
Matthew Wilcox <matthew@....cx> wrote:

> On Wed, Apr 16, 2008 at 09:50:26AM -0700, Arjan van de Ven wrote:
> > yup. For kcounters there is a clear owner for each "slot".
> > [This is the part that makes it debugable again)
> > 
> > Now for non-debug builds, the space taken for the token can be..
> > zero depending on how we define the types for it.
> 
> Hm.  That might be worth changing the API for.  Right now, I'm
> overloading the return value of kcounter_claim with an errno and a
> cookie.  Maybe we should go for:
> 
> extern int __must_check kcounter_claim(struct kcounter *kc,
> kcounter_cookie_t *resource);
> 
> with the return value being 0 or errno and on success, kcounter_claim
> writes a cookie to 'resource'?

or we return a cookie, and define some sort of "cookie_is_error()" thing

> 


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