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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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2
fs/btrfs/dev-replace.c
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@@ -986,7 +986,7 @@ static int btrfs_dev_replace_kthread(void *data)
return 0;
}
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
{
if (!dev_replace->is_valid)
return 0;