linux-kernel - Re: [PATCH v4 1/3] dax: Add an enum for specifying dax wakup mode

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Date:   Mon, 26 Apr 2021 14:46:32 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
        virtio-fs@...hat.com, miklos@...redi.hu, jack@...e.cz,
        slp@...hat.com, groug@...d.org
Subject: Re: [PATCH v4 1/3] dax: Add an enum for specifying dax wakup mode

On Fri, Apr 23, 2021 at 09:07:21AM -0400, Vivek Goyal wrote:
> +enum dax_wake_mode {
> +	WAKE_NEXT,
> +	WAKE_ALL,
> +};

Why define them in this order when ...

> @@ -196,7 +207,7 @@ static void dax_wake_entry(struct xa_state *xas, void *entry, bool wake_all)
>  	 * must be in the waitqueue and the following check will see them.
>  	 */
>  	if (waitqueue_active(wq))
> -		__wake_up(wq, TASK_NORMAL, wake_all ? 0 : 1, &key);
> +		__wake_up(wq, TASK_NORMAL, mode == WAKE_ALL ? 0 : 1, &key);

... they're used like this?  This is almost as bad as

enum bool {
	true,
	false,
};