linux-kernel - Re: [PATCH 1/9] of: move phandle/ihandle into types.h

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Date:	Fri, 3 Sep 2010 04:17:15 -0400
From:	Andres Salomon <dilinger@...ued.net>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	devicetree-discuss@...ts.ozlabs.org, sparclinux@...r.kernel.org,
	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, cjb@...top.org, Mitch Bradley <wmb@...top.org>,
	pgf@...top.org, linux-kernel@...r.kernel.org, davem@...emloft.net,
	grant.likely@...retlab.ca,
	Stephen Neuendorffer <stephen.neuendorffer@...inx.com>
Subject: Re: [PATCH 1/9] of: move phandle/ihandle into types.h

On Mon, 30 Aug 2010 07:06:27 +0200
Sam Ravnborg <sam@...nborg.org> wrote:

> On Sun, Aug 29, 2010 at 11:53:52PM -0400, Andres Salomon wrote:
> > 
> > We need phandle for some exported sparc headers; of.h isn't an
> > exported header, and it would be silly to export it when all we
> > really need is one or two types from it.  So, move the
> > phandle/ihandle definitions into types.h.
> > 
> > diff --git a/include/linux/types.h b/include/linux/types.h
> > index 01a082f..26526ea 100644
> > --- a/include/linux/types.h
> > +++ b/include/linux/types.h
> > @@ -219,6 +219,10 @@ struct ustat {
> >  	char			f_fpack[6];
> >  };
> >  
> > +/* Basic openboot/openfirmware types */
> > +typedef u32 phandle;
> > +typedef u32 ihandle;
> > +
> >  #endif	/* __KERNEL__ */
> 
> The above is inside #ifdef __KERNEL__ / #endif
> so it is not exported as we drop code protected
> by __KERNEL__ when we prepare for export.



At least for me, that's fine; I don't need phandle/ihandle to be
available to userspace.  The folks who work on the userspace fdt code
may feel differently, however.

(I'm not sure if you're suggesting it be outside the __KERNEL__ ifdef
or not..)

> 
> Id addition "phandle" and "ihandle" needs to have
> two underscores apended as we cannot just add the above
> to the userspace namespace and expect it to be OK.
> 
> We do this for many other typers already, see __u32 for example.
> 
> 	Sam

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