On Fri, Oct 08, 2010 at 10:17:59AM -0700, David Miller wrote:
> From: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Date: Fri, 8 Oct 2010 11:12:10 -0600
>
> > On Fri, Oct 08, 2010 at 12:43:54AM -0700, 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. Also, later patches
> >> use phandle in structs that are exported to userspace, so export
> >> a __kernel_phandle type.
> >>
> >> Signed-off-by: Andres Salomon <dilinger@xxxxxxxxxx>
> >
> > Looks okay to me. I'm build testing it now on powerpc and
> > microblaze. If davem agrees, then I'll pick it up into my
> > devicetree-next branch.
> >
> > Question though; since sparc userspace is the only user of this,
> > should the types.h header avoid exposing it on non-sparc?
>
> I can't think of anything in Sparc userspace that needs the
> phandle_t type.
>
> In fact I was a bit confused when you asked Andres to expose
> it to userspace.
>
> What I remember from a previous thread is that some other platforms
> use the type in their DT device-tree building tools or whatever, but
> they define phandle_t for themselves I remember specifically
> mentioning sparc has no use for this currently.
Weird. Yeah, no other platforms expect to get a phandle type
definition from the kernel headers. The only thing driving this
conversation is from arch/sparc/include/asm/Kbuild:
header-y += openprom.h
I don't have any background on the history of that file or why it
needs to be exported to userspace. There seems to be a lot of stuff
in there; but I cannot see the *_funcs structures having any utility
outside of the kernel. Perhaps they should be moved out of
asm/openprom.h?
Here are the two affected structures:
$ git grep linux_nodeops arch/sparc/include
arch/sparc/include/asm/openprom.h: struct linux_nodeops *pv_nodeops;
arch/sparc/include/asm/openprom.h:struct linux_nodeops {
arch/sparc/include/asm/oplib_32.h:extern struct linux_nodeops *prom_nodeops;
$ git grep linux_dev_v2_funcs arch/sparc/include
arch/sparc/include/asm/openprom.h:struct linux_dev_v2_funcs {
arch/sparc/include/asm/openprom.h: struct linux_dev_v2_funcs pv_v2devops;
(devicetree/next) ~/hacking/linux-2.6$
And linux_romvec references linux_nodeops:
$ git grep linux_romvec arch/sparc/include
arch/sparc/include/asm/openprom.h:struct linux_romvec {
arch/sparc/include/asm/oplib_32.h:extern struct linux_romvec *romvec;
arch/sparc/include/asm/oplib_32.h:extern void prom_init(struct linux_romvec *rom_ptr);
oplib_32.h is not exported.
g.
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