linux-kernel - Re: [PATCH 1/6] lguest: host code tidyups

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Date:	Wed, 16 May 2007 08:00:15 +0100
From:	hch <hch@...radead.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>, hch <hch@...radead.org>
Subject: Re: [PATCH 1/6] lguest: host code tidyups

On Wed, May 16, 2007 at 09:32:16AM +1000, Rusty Russell wrote:
> On Tue, 2007-05-15 at 21:47 +1000, Stephen Rothwell wrote:
> > On Tue, 15 May 2007 21:42:35 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > >
> > > On Tue, 15 May 2007 11:17:07 +1000 Rusty Russell <rusty@...tcorp.com.au> wrote:
> > > > -		on_each_cpu(adjust_pge, 0, 0, 1);
> > > > +		on_each_cpu(adjust_pge, (void *)0, 0, 1);
> > >
> > > Sorry?  What ever happened to a simple NULL?
> > 
> > Oh, I guess that is an explicit (numeric) 0 (of some type) caste to
> > "void *" because of the prototype - rather than not passing anything?
> 
> Indeed.  We really want to pass a bool, but on_each_cpu uses a void *.
> Hence the clearest solution seemed "(void *)0" and "(void *)1" in the
> callers.

Cleanest way to do that is to pass the value by reference.

	const int some_useful_name = 0;

	 on_each_cpu(adjust_pge, &some_useful_name, 0, 1);
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