Commit 86a76331 authored Apr 01, 2020 by WANG Wenhu Committed by Linus Torvalds Apr 02, 2020

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>

parent 3e69ad08

mm/memory.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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
		*

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