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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 <wenhu.wang@vivo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200310073955.43415-1-wenhu.wang@vivo.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
alistair/sensors
WANG Wenhu 2020-04-01 21:09:03 -07:00 committed by Linus Torvalds
parent 3e69ad081c
commit 86a76331d9
1 changed files with 1 additions and 1 deletions
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mm/memory.c
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@ -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
*