Create a linked list in linux kernel 5.3

In the post "Creating linked list in linux Kernel using the list" we saw how to create a linked list in a kernel. Find below the updated code which works is tested in kernel 5.3

#include<linux/kernel.h> #include<linux/module.h> #include<linux/list.h> #include<linux/slab.h> struct k_list { struct list_head test_list; int temp; }; int create_list_init(void) { struct k_list *one,*two,*three,*entry; struct list_head test_head; struct list_head *ptr; one=kmalloc(sizeof(struct k_list *),GFP_KERNEL); two=kmalloc(sizeof(struct k_list *),GFP_KERNEL); three=kmalloc(sizeof(struct k_list *),GFP_KERNEL); one->temp=10; two->temp=20; three->temp=30; INIT_LIST_HEAD(&test_head); list_add_tail(&one->test_list,&test_head); list_add_tail(&two->test_list,&test_head); list_add_tail(&three->test_list,&test_head); ptr=&(one->test_list); list_for_each(ptr,&test_head){ entry=list_entry(ptr,struct k_list,test_list); printk(KERN_INFO "\n Hello %d \n \n\n ", entry->temp); } printk(KERN_INFO "\n \n\n "); return 0; } void create_list_exit(void) { return 0 ; } module_init(create_list_init); module_exit(create_list_exit);

Save the file as linked_list.c and use the following makefile to compile the code ifneq ($(KERNELRELEASE),) obj-m := linked_list.o else KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD := $(shell pwd) default: $(MAKE) -C $(KERNELDIR) M=$(PWD) modules clean: $(MAKE) -C $(KERNELDIR) M=$(PWD) clean endif

Compile and insert the module using the following commands

$ make $ sudo insmod linked_list.ko

Run the command dmesg to see the linked list values being printed. [ 3651.645598] Hello 10 [ 3651.645600] Hello 20 [ 3651.645602] Hello 30