From: WANG Wenhu Date: Thu, 2 Apr 2020 04:09:03 +0000 (-0700) Subject: mm: clarify a confusing comment for remap_pfn_range() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=86a76331d94c4cfa72fe1831dbe4b492f66fdb81;p=linux.git mm: clarify a confusing comment for remap_pfn_range() It really made me scratch my head. Replace the comment with an accurate and consistent description. The parameter pfn actually refers to the page frame number which is right-shifted by PAGE_SHIFT from the physical address. Signed-off-by: WANG Wenhu Signed-off-by: Andrew Morton Reviewed-by: Andrew Morton Link: http://lkml.kernel.org/r/20200310073955.43415-1-wenhu.wang@vivo.com Signed-off-by: Linus Torvalds --- diff --git a/mm/memory.c b/mm/memory.c index e8bfdf0d9d1dd..583f845198702 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1939,7 +1939,7 @@ static inline int remap_p4d_range(struct mm_struct *mm, pgd_t *pgd, * 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 *