Reallocate memory. the contents will remain unchanged.
void * krealloc(const void * p, size_t new_size, gfp_t flags);
p
object to reallocate memory for.
new_size
how many bytes of memory are required.
flags
the type of memory to allocate.
The contents of the object pointed to are preserved up to the lesser of the new and old sizes. If p is NULL, krealloc behaves exactly like kmalloc. If new_size is 0 and p is not a NULL pointer, the object pointed to is freed.