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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
parent 351810c1d2
commit f8c269d722
6 changed files with 18 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

6
fs/btrfs/dev-replace.c
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@ -670,8 +670,8 @@ void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
srcdev = dev_replace->srcdev;
args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
div64_u64(btrfs_device_get_total_bytes(srcdev), 1000));
args->status.progress_1000 = div_u64(dev_replace->cursor_left,
div_u64(btrfs_device_get_total_bytes(srcdev), 1000));
break;
}
btrfs_dev_replace_unlock(dev_replace);
@ -806,7 +806,7 @@ static int btrfs_dev_replace_kthread(void *data)
btrfs_dev_replace_status(fs_info, status_args);
progress = status_args->status.progress_1000;
kfree(status_args);
do_div(progress, 10);
progress = div_u64(progress, 10);
printk_in_rcu(KERN_INFO
"BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
dev_replace->srcdev->missing ? "<missing disk>" :