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btrfs: add __pure attribute to functions

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The attribute is more relaxed than const and the functions could
dereference pointers, as long as the observable state is not changed. We
do have such functions, based on -Wsuggest-attribute=pure .

The visible effects of this patch are negligible, there are differences
in the assembly but hard to summarize.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-10-01 19:57:39 +02:00
parent 4143cb8b6f
commit e1f60a6580
9 changed files with 12 additions and 14 deletions
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6
fs/btrfs/async-thread.c
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@ -53,14 +53,12 @@ struct btrfs_workqueue {
struct __btrfs_workqueue *high;
};
struct btrfs_fs_info *
btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
{
return wq->fs_info;
}
struct btrfs_fs_info *
btrfs_work_owner(const struct btrfs_work *work)
struct btrfs_fs_info * __pure btrfs_work_owner(const struct btrfs_work *work)
{
return work->wq->fs_info;
}