MODULE_VERSION and srcversion

kernel_config_fragment

@@ -1,6 +1,9 @@
 # Changes to this file are automatically trigger kernel reconfigures
 # even without using the linux-reconfigure target.
 
+CONFIG_MODULE_SRCVERSION_ALL=y
+
+# GDB debugging.
 CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_KERNEL=y

kernel_module/README.md

@@ -9,6 +9,7 @@
     1.  [params](params.c)
     1.  [vermagic](vermagic.c)
     1.  [vermagic_fail](vermagic_fail.c)
+    1.  [module_version](module_version.c)
 1.  Pseudo filesystems
     1.  [debugfs](debugfs.c)
     1.  [procfs](procfs.c)

kernel_module/module_version.c

@@ -0,0 +1,28 @@
+/*
+https://stackoverflow.com/questions/4839024/how-to-find-the-version-of-a-compiled-kernel-module/42556565#42556565
+
+    insmod /module_version.ko
+    cat /sys/modules/module_version/version
+    # => 1.0
+    cat /sys/module/module_version/srcversion
+    # => AB0F06618BC3A36B687CDC5
+    modinfo /module_version.ko | grep -E '^(src|)version'
+    # => version:        1.0
+    # => srcversion:     AB0F06618BC3A36B687CDC5
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+static int myinit(void)
+{
+	pr_info(__FILE__ "\n");
+	return 0;
+}
+
+static void myexit(void) {}
+
+module_init(myinit)
+module_exit(myexit)
+MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL");

kernel_module/vermagic.c

@@ -1,7 +1,9 @@
 /*
     insmod /vermagic.ko
     # => 4.9.6 SMP mod_unload modversions
-TODO how to get the vermagic from running kernel from userland? <https://lists.kernelnewbies.org/pipermail/kernelnewbies/2012-October/006306.html>
+
+TODO how to get the vermagic from running kernel from userland?
+<https://lists.kernelnewbies.org/pipermail/kernelnewbies/2012-October/006306.html>
 */
 
 #include <linux/module.h>
@@ -10,7 +12,7 @@ TODO how to get the vermagic from running kernel from userland? <https://lists.k
 
 static int myinit(void)
 {
-	pr_info(VERMAGIC_STRING "\n");
+	pr_info(__FILE__ "\n");
 	return 0;
 }