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btrfs: use DIV_ROUND_UP instead of open-coded variants

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The form

  (value + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT

is equivalent to

  (value + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE

The rest is a simple subsitution, no difference in the generated
assembly code.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba
2014-06-05 01:59:57 +02:00
committed by Chris Mason
parent 4e54b17ad6
commit ed6078f703
8 changed files with 22 additions and 32 deletions
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3
fs/btrfs/zlib.c
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@@ -225,8 +225,7 @@ static int zlib_decompress_biovec(struct list_head *ws, struct page **pages_in,
size_t total_out = 0;
unsigned long page_in_index = 0;
unsigned long page_out_index = 0;
unsigned long total_pages_in = (srclen + PAGE_CACHE_SIZE - 1) /
PAGE_CACHE_SIZE;
unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_CACHE_SIZE);
unsigned long buf_start;
unsigned long pg_offset;