From 8c55e446203ba1a78d2a2a5ac28c312465823dc0 Mon Sep 17 00:00:00 2001
From: Flora Cui <flora.cui@amd.com>
Date: Wed, 18 Sep 2019 10:39:34 +0800
Subject: [PATCH] drm/amd/autoconf: fix check for
 hwmon_device_register_with_groups()

<linux/stddef.h> is needed for NULL pointer definition
this is for rhel 7.4/7.5/7.6

Signed-off-by: Flora Cui <flora.cui@amd.com>
Reviewed-by: Jack Gui <Jack.Gui@amd.com>
---
 drivers/gpu/drm/amd/dkms/m4/hwmon-device-register-with-groups.m4 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/dkms/m4/hwmon-device-register-with-groups.m4 b/drivers/gpu/drm/amd/dkms/m4/hwmon-device-register-with-groups.m4
index a45396b0aa1ee..8168fefce9e07 100644
--- a/drivers/gpu/drm/amd/dkms/m4/hwmon-device-register-with-groups.m4
+++ b/drivers/gpu/drm/amd/dkms/m4/hwmon-device-register-with-groups.m4
@@ -7,6 +7,7 @@ dnl # to the hwmon device directly and no longer with its parent device.
 AC_DEFUN([AC_AMDGPU_4ARGS_HWMON_DEVICE_REGISTER_WITH_GROUPS],
 	[AC_MSG_CHECKING([whether hwmon_device_register_with_groups() wants 4 args])
 	AC_KERNEL_TRY_COMPILE_SYMBOL([
+		#include <linux/stddef.h>
 		#include <linux/hwmon.h>
 	], [
 		hwmon_device_register_with_groups(NULL, NULL, NULL, NULL);