linux-kernel - Re: [PATCH] module: kzalloc mod->ref

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Date:	Wed, 28 Jan 2009 22:54:50 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Takashi Iwai <tiwai@...e.de>, Ingo Molnar <mingo@...hat.com>,
	Tejun Heo <tj@...nel.org>, Kyle McMartin <kyle@...radead.org>,
	linux-kernel@...r.kernel.org, Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [PATCH] module: kzalloc mod->ref

On Tuesday 27 January 2009 23:45:34 Ingo Molnar wrote:
> 
> * Rusty Russell <rusty@...tcorp.com.au> wrote:
> 
> > @@ -344,8 +339,11 @@ struct module
> >  	/* Destruction function. */
> >  	void (*exit)(void);
> >  
> > -	/* Reference counts */
> > -	struct module_ref ref[NR_CPUS];
> > +#ifdef CONFIG_SMP
> > +	char *refptr;
> > +#else
> > +	local_t ref;
> > +#endif
> 
> hm, that construct looks rather ugly. Is there no way to provide a clean 
> data type and APIs for this that just work symmetrically on both SMP and 
> UP?

Part of me agreed when I first read it, but unification means UP would do an alloc as well.  Neater, but less efficient.

But maybe these days UP means embedded, and hence no modules anyway :)

Hope that clarifies,
Rusty.
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