drm: FreeBSD: Make drm_timestamp_precision and drm_vblank_offdelay ac…

[jorgem-seq]

…cessible from drm_sysctl_freebsd.c

Remove the static keyword from drm_timestamp_precision and
drm_vblank_offdelay in drivers/gpu/drm/drm_vblank.c to allow them to be seen
from other files, drivers/gpu/drm/drm_sysctl_freebsd.c in this case.

Signed-off-by: Jorge Maidana jorgem.seq@gmail.com

[jorgem-seq]

In drivers/gpu/drm/drm_vblank.c the variables drm_timestamp_precision and drm_vblank_offdelay are declared as static preventing those variables to be seen from other source files:

drm-kmod/drivers/gpu/drm/drm_vblank.c

Lines 91 to 93 in 94a257b

	static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
	static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */

In drivers/gpu/drm/drm_sysctl_freebsd.c those 2 variables are declared
as extern meaning that they are defined elsewhere, but you can't access
them because of the static keyword mentioned above:

drm-kmod/drivers/gpu/drm/drm_sysctl_freebsd.c

Lines 46 to 47 in 94a257b

	extern int drm_vblank_offdelay;
	extern unsigned int drm_timestamp_precision;

This leads to undefined behavior and random crashes like #6.

[evadot]

Please do another merge request for the COMPAT change.