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btrfs: cleanup 64bit/32bit divs, compile time constants

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Switch to div_u64 if the divisor is a numeric constant or sum of
sizeof()s. We can remove a few instances of do_div that has the hidden
semtantics of changing the 1st argument.

Small power-of-two divisors are converted to bitshifts, large values are
kept intact for clarity.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2015-01-16 17:21:12 +01:00
commit 16068ec19f
6 changed files with 18 additions and 21 deletions
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