From 31ccf3b44e6cfb165c71f1140fb5033bf58db340 Mon Sep 17 00:00:00 2001 From: WANG Wenhu Date: Wed, 1 Apr 2020 21:09:03 -0700 Subject: [PATCH] mm: clarify a confusing comment for remap_pfn_range() commit 86a76331d94c4cfa72fe1831dbe4b492f66fdb81 upstream. 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 Signed-off-by: Harshvardhan Jha Signed-off-by: Greg Kroah-Hartman --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index f8d76c66311d..238064ef73ae 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1921,7 +1921,7 @@ 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 *