Update check_config for MEMCG_KMEM

CONFIG_MEMCG_KMEM is removed since 4.6, it's accounted by default
since 4.6, so it's merged to CONFIG_MEMCG.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>

contrib/check-config.sh

@@ -206,12 +206,16 @@ echo 'Optional Features:'
 	check_flags CGROUP_PIDS
 }
 {
-	check_flags MEMCG_KMEM MEMCG_SWAP MEMCG_SWAP_ENABLED
+	check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED
 	if  is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
 		echo "    $(wrap_color '(note that cgroup swap accounting is not enabled in your kernel config, you can enable it by setting boot option "swapaccount=1")' bold black)"
 	fi
 }
 
+if [ "$kernelMajor" -lt 4 ] || [ "$kernelMajor" -eq 4 -a "$kernelMinor" -le 5 ]; then
+	check_flags MEMCG_KMEM
+fi
+
 if [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 18 ]; then
 	check_flags RESOURCE_COUNTERS
 fi