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Here are the steps to implement kmalloc in C:

1. Include the necessary header files:

#include <linux/slab.h>    
#include <linux/module.h>  
#include <linux/kernel.h>  

1. Allocate memory using the kmalloc function:

void *pointer; 
pointer = kmalloc(size, GFP_KERNEL); 

where size is the amount of memory to allocate and GFP_KERNEL is the allocation flag.

1. Check if the memory was allocated successfully:

if (!pointer){ 
    printk(KERN_INFO "Memory allocation failed"); 
}    

1. Use the allocated memory:

strcpy(pointer, "Hello world");    

1. Free the allocated memory when it is no longer needed:

kfree(pointer);    

Make sure to free the memory to avoid memory leaks.