--- a/mm/memory.c~mm-clarify-a-confusing-comment-of-remap_pfn_range +++ a/mm/memory.c @@ -1939,7 +1939,7 @@ static inline int remap_p4d_range(struct * remap_pfn_range - remap kernel memory to userspace * @vma: user vma to map to * @addr: target user address to start at - * @pfn: physical address of kernel memory + * @pfn: page frame number of kernel physical memory address * @size: size of map area * @prot: page protection flags for this mapping *