devPrivates patch

[Eamon Walsh]

Commit b6ab114212c0e4c3346ceb5b207f14c526ab81e7 changes the server
devPrivates to be based on an array, which should fix the performance
problems that have been reported, for example
http://bugs.freedesktop.org/show_bug.cgi?id=16647

With this change, the key values become pointer-to-int, and they need to
actually point to some space where an integer can be stored.  Basically
this:

    static DevPrivateKey foo = &foo;

needs to change to this:

    static int blah;
    static DevPrivateKey foo = &blah;

Or, perhaps simpler:
    static int blah;  /* use (&blah) as the key. */


The xserver tree and drivers have already been changed, in particular
xserver commit ebea78cdba0ff14a397239ee1936bd254c181e1b (thanks to Tomas
Carnecky for this work).  Out-of-tree driver writers take note.

This change (by itself, at least) will not break older servers using
newer drivers, since the pointer values are still unique.


-- 
Eamon Walsh <ewalsh at tycho.nsa.gov>
National Security Agency