'use scratch pixmaps' issue

[Cui, Hunk]

Hi, Dave

	On your 'use scratch pixmaps' patch, (
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=a493fe
b94c0d84aaf5bfd84c6940d7f03974dd86 ), I see you use the
drmmode_create_bo_pixmap & drmmode_destroy_bo_pixmap functions to
replace the GetScratchPixmapHeader & FreeScratchPixmapHeader, you said
it use your own wrapper to allocate a pixmap for wrapping a bo in.

	Can you tell me what the purpose of the modified is? I also had
the same problem in xf86-video-geode driver.

	Hope you can give me help. :)

Thanks,
Hunk Cui