[PATCH/RFC] add proc_dir_entry fields to device_node

[Nathan Lynch]

> The comment is valid. You cannot change the format of struct
> device_node on ppc32 without breaking BootX booting :(
>
> The solution to this is to finally break it by having a conversion
> step between the BootX-passed device-tree and the in-kernel one

What about something like this as a short term solution?  The ppc64
versions of the macros would store the proc_dir_entry pointers in the
device nodes as they are added, e.g.

#define set_node_proc_entry(node,entry) node->pde = entry
#define set_node_name_link(node,entry) node->name_link = entry
#define set_node_addr_link(node,entry) node->addr_link = entry

while the ppc versions are no-ops.  This would preserve source
compatibility while keeping us from breaking BootX.

Separate patches against kernel.org 2.6.0-test6 attached.

Nathan
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