Re: [PATCH v2 02/10] blktrace: move blktrace debugfs creation to helper function

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Sun, Apr 19, 2020 at 07:45:21PM +0000, Luis Chamberlain wrote:
> Move the work to create the debugfs directory used into a helper.
> It will make further checks easier to read. This commit introduces
> no functional changes.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
> ---
>  kernel/trace/blktrace.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index ca39dc3230cb..2c6e6c386ace 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -468,6 +468,18 @@ static void blk_trace_setup_lba(struct blk_trace *bt,
>  	}
>  }
>  
> +static struct dentry *blk_trace_debugfs_dir(struct blk_user_trace_setup *buts,
> +					    struct blk_trace *bt)
> +{
> +	struct dentry *dir = NULL;
> +
> +	dir = debugfs_lookup(buts->name, blk_debugfs_root);
> +	if (!dir)
> +		bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root);
> +

This creates an > 80 char line.  But I also think it is rather confusing
anyway, why not:

	dir = debugfs_lookup(buts->name, blk_debugfs_root);
	if (dir)
		return dir;
	bt->dir = debugfs_create_dir(buts->name, blk_debugfs_root);
	return bt->dir;