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raid5: update code comment of scribble_alloc()

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Code comments of scribble_alloc() is outdated for a while. This patch
update the comments in function header for the new parameter list.

Suggested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Coly Li
2020-04-09 22:17:22 +08:00
committed by Song Liu
parent ba54d4d4d2
commit 7f8a30e5d2
1 changed files with 5 additions and 2 deletions
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7
drivers/md/raid5.c
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@@ -2215,10 +2215,13 @@ static int grow_stripes(struct r5conf *conf, int num)
} }
/** /**
* scribble_len - return the required size of the scribble region * scribble_alloc - allocate percpu scribble buffer for required size
* of the scribble region
* @percpu - from for_each_present_cpu() of the caller
* @num - total number of disks in the array * @num - total number of disks in the array
* @cnt - scribble objs count for required size of the scribble region
* *
* The size must be enough to contain: * The scribble buffer size must be enough to contain:
* 1/ a struct page pointer for each device in the array +2 * 1/ a struct page pointer for each device in the array +2
* 2/ room to convert each entry in (1) to its corresponding dma * 2/ room to convert each entry in (1) to its corresponding dma
* (dma_map_page()) or page (page_address()) address. * (dma_map_page()) or page (page_address()) address.