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+title:IRQ handler
+keywords:kernel,linux,irq
+
+# IRQ handler
+
+Lets extend hello world driver. 
+
+## Starting point
+
+__Makefile__
+```Makefile
+obj-m += procfs_entry.o
+
+KDIR ?= /lib/modules/$(shell uname -r)/build
+
+all:
+	make -C $(KDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KDIR) M=$(PWD) clean
+```
+
+__procfs_entry.c__
+```c
+#include <linux/module.h>  /* Needed by all modules */
+#include <linux/kernel.h>
+
+int procfs_entry_init( void )
+{
+	printk(KERN_DEBUG "Hello Procfs!\n");
+	return 0;
+}
+
+void procfs_entry_exit( void )
+{
+	printk(KERN_DEBUG "Exit Procfs!\n");
+}
+
+module_init( procfs_entry_init );
+module_exit( procfs_entry_exit );
+
+MODULE_LICENSE("GPL");
+```
+
+
+
+## List of procfs functions used
+
+| Function name | Note |
+|---|---|
+| proc_mkdir | Create procfs directory |
+| proc_create | Create procfs file |
+| proc_remove | Remove procfs entry |
+
+## Final result
+
+
+
+## Links
+
+
+
+
+