Building with the attached random configuration file,

drivers/gpu/drm/nouveau/nouveau_hwmon.c: In function ‘nouveau_hwmon_init’:
drivers/gpu/drm/nouveau/nouveau_hwmon.c:633:2: error: ‘hwmon’ undeclared (first
use in this function)
  hwmon->hwmon = NULL;
  ^
drivers/gpu/drm/nouveau/nouveau_hwmon.c:633:2: note: each undeclared
identifier is reported only once for each function it appears in
make[4]: *** [drivers/gpu/drm/nouveau/nouveau_hwmon.o] Error 1