kernel: unify version

kernel/Makefile

@@ -12,6 +12,12 @@ obj-y += embed_ksud.o
 obj-y += kernel_compat.o
 
 obj-y += selinux/
+# We must use the absolute path to git, otherwise the build will fail if git is not in the PATH
+KSU_GIT_VERSION := $(shell cd $(srctree)/$(src);/usr/bin/git rev-list --count HEAD)
+ifeq ($(KSU_GIT_VERSION),)
+$(error Get git version failed, please make sure git is installed in /usr/bin/git)
+endif
+ccflags-y += -DKSU_GIT_VERSION=$(KSU_GIT_VERSION)
 
 ifndef EXPECTED_SIZE
 EXPECTED_SIZE := 0x033b

kernel/ksu.h

@@ -3,7 +3,11 @@
 
 #include "linux/workqueue.h"
 
-#define KERNEL_SU_VERSION 15
+#ifndef KSU_GIT_VERSION
+#error "KSU_GIT_VERSION not defined! Please check Makefile."
+#else
+#define KERNEL_SU_VERSION (10000 + KSU_GIT_VERSION + 200) // major * 10000 + git version + 200 for historical reasons
+#endif
 
 #define KERNEL_SU_OPTION 0xDEADBEEF