Re: /proc parent &proc_root == NULL?

[Al Viro <viro@parcelfarce.linux.theplanet.co.uk>]

On Wed, Jan 26, 2005 at 09:33:48PM -0500, John Richard Moser wrote:
> create_proc_entry("kmsg", S_IRUSR, &proc_root);
> 
> So this is asking for proc_root to be filled?
> 
> create_proc_entry("kcore", S_IRUSR, NULL);
> 
> And this is just saying to shove it in proc's root?

NULL is equivalent to &proc_root in that context; moreover, it's better
style - drivers really shouldn't be refering to what is procfs-private
object.

> I'm trying to locate a specific proc entry, using this lovely piece of
> code I ripped off:

That's not something allowed outside of procfs code - lifetime rules
alone make that a Very Bad Idea(tm).  If that's just debugging - OK,
but if your code really uses that stuff, I want details on the intended
use.  In that case your design is almost certainly asking for trouble.