[patch 102/155] mm: clarify a confusing comment for remap_pfn_range()

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From: WANG Wenhu <wenhu.wang@xxxxxxxx>
Subject: 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.

Link: http://lkml.kernel.org/r/20200310073955.43415-1-wenhu.wang@xxxxxxxx
Signed-off-by: WANG Wenhu <wenhu.wang@xxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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
  *
_




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