Put building of drm and drm2 modules behind options.

Make the building of drm dependent on MK_MODULE_DRM and the building
of module drm2 on MK_MODULE_DRM2. The defaults are unchanged.

Approved by: re@ (gjb)
Differential Review: https://reviews.freebsd.org/D16894

sys/conf/kern.opts.mk

@@ -38,6 +38,8 @@ __DEFAULT_YES_OPTIONS = \
     IPSEC_SUPPORT \
     ISCSI \
     KERNEL_SYMBOLS \
+    MODULE_DRM \
+    MODULE_DRM2 \
     NETGRAPH \
     PF \
     SOURCELESS_HOST \

sys/modules/Makefile

@@ -583,8 +583,12 @@ _cpuctl=	cpuctl
 _cpufreq=	cpufreq
 _cs=		cs
 _dpms=		dpms
+.if ${MK_MODULE_DRM} != "no"
 _drm=		drm
+.endif
+.if ${MK_MODULE_DRM2} != "no"
 _drm2=		drm2
+.endif
 _ed=		ed
 _em=		em
 _ena=		ena
@@ -781,7 +785,9 @@ _cardbus=	cardbus
 _cbb=		cbb
 _cfi=		cfi
 _cpufreq=	cpufreq
+.if ${MK_MODULE_DRM} != "no"
 _drm=		drm
+.endif
 _exca=		exca
 _ffec=		ffec
 _nvd=		nvd
@@ -791,7 +797,9 @@ _wi=		wi
 .endif
 
 .if ${MACHINE_ARCH} == "powerpc64"
+.if ${MK_MODULE_DRM2} != "no"
 _drm2=		drm2
+.endif
 _ipmi=		ipmi
 .endif
 .if ${MACHINE_ARCH} == "powerpc64" || ${MACHINE_ARCH} == "powerpc"

tools/build/options/WITHOUT_MODULE_DRM

@@ -0,0 +1,3 @@
+.\" $FreeBSD$
+Disable creation of old drm video modules.
+

tools/build/options/WITHOUT_MODULE_DRM2

@@ -0,0 +1,2 @@
+.\" $FreeBSD$
+Disable creation of old drm2 video modules.

tools/build/options/WITH_MODULE_DRM

@@ -0,0 +1,2 @@
+.\" $FreeBSD$
+Enable creation of old drm video modules.

tools/build/options/WITH_MODULE_DRM2

@@ -0,0 +1,2 @@
+.\" $FreeBSD$
+Enable creation of old drm2 video modules.