AC_DEFUN([AC_AMDGPU_MMGRAB],[
	AC_MSG_CHECKING([whether mmgrab() is available in linux/sched/mm.h])
dnl #
dnl # commit 68e21be2916b3
dnl # sched/headers: Move task->mm handling methods to <linux/sched/mm.h>
dnl #
	AC_KERNEL_TRY_COMPILE([
		#include <linux/sched/mm.h>
	], [
		mmgrab(NULL);
	], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_MMGRAB, 1, [mmgrab() is available])
	], [
		AC_MSG_RESULT(no)
		AC_MSG_CHECKING([whether mmgrab() is available in linux/sched.h])
dnl #
dnl # commit f1f1007644ffc
dnl # mm: add new mmgrab() helper
dnl #
		AC_KERNEL_TRY_COMPILE([
			#include <linux/sched.h>
		], [
			mmgrab(NULL);
		], [
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_MMGRAB, 1, [mmgrab() is available])
		], [
			AC_MSG_RESULT(no)
			AC_MSG_CHECKING([whether mmgrab() is available in drm_backport.h])
dnl #
dnl # rhel 7.x wrapp mmgrab() in drm_backport.h
dnl #
			AC_KERNEL_TRY_COMPILE([
				#include <drm/drm_backport.h>
			], [
				mmgrab(NULL);
			], [
				AC_MSG_RESULT(yes)
				AC_DEFINE(HAVE_MMGRAB, 1, [mmgrab() is available])
			], [
				AC_MSG_RESULT(no)
			])
		])
	])
])