Added linux module to find sum of digits of a number

Author: Udbhav

digits_sum/Makefile

@@ -0,0 +1,6 @@
+obj-m += digitsum.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

digits_sum/digitsum.c

@@ -0,0 +1,25 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+static int n = 5;
+module_param(n,int,0);
+MODULE_PARM_DESC(n,"given number");
+
+
+int init_module(void){
+
+	static int sum=0;
+	static int temp=n;
+	while(temp>0)
+	{
+		sum+=(temp%10);
+		temp/=10;
+	}
+   	printk(KERN_INFO "Sum_of_digits: %d",sum);
+    	return 0;   
+}
+
+void cleanup_module(void){
+    printk(KERN_INFO "goodbye world");
+}