btrfs: cleanup 64bit/32bit divs, compile time constants
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>
diff --git a/fs/btrfs/math.h b/fs/btrfs/math.h
index b7816ce..1b10a3c 100644
--- a/fs/btrfs/math.h
+++ b/fs/btrfs/math.h
@@ -28,8 +28,7 @@
if (factor == 10)
return num;
num *= factor;
- do_div(num, 10);
- return num;
+ return div_u64(num, 10);
}
static inline u64 div_factor_fine(u64 num, int factor)
@@ -37,8 +36,7 @@
if (factor == 100)
return num;
num *= factor;
- do_div(num, 100);
- return num;
+ return div_u64(num, 100);
}
#endif