linux-kernel - Re: [PATCH 05/15] drivers: input: Drop unlikely before IS_ERR(_OR

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Date:	Fri, 31 Jul 2015 09:58:41 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	akpm@...ux-foundation.org, linaro-kernel@...ts.linaro.org,
	linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	"open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)..." 
	<linux-input@...r.kernel.org>, Masaki Ota <masaki.ota@...alps.com>,
	Pali Rohár <pali.rohar@...il.com>
Subject: Re: [PATCH 05/15] drivers: input: Drop unlikely before
 IS_ERR(_OR_NULL)

On Fri, Jul 31, 2015 at 02:08:25PM +0530, Viresh Kumar wrote:
> IS_ERR(_OR_NULL) already contain an 'unlikely' compiler flag and there
> is no need to do that again from its callers. Drop it.

I'd rather keep it as it documents the expected behavior and double
unlikely should work just fine.

> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/input/mouse/alps.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> index 113d6f1516a5..cef3611a4ccd 100644
> --- a/drivers/input/mouse/alps.c
> +++ b/drivers/input/mouse/alps.c
> @@ -1365,7 +1365,7 @@ static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
>  		/* On V2 devices the DualPoint Stick reports bare packets */
>  		dev = priv->dev2;
>  		dev2 = psmouse->dev;
> -	} else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
> +	} else if (IS_ERR_OR_NULL(priv->dev3)) {
>  		/* Register dev3 mouse if we received PS/2 packet first time */
>  		if (!IS_ERR(priv->dev3))
>  			psmouse_queue_work(psmouse, &priv->dev3_register_work,
> -- 
> 2.4.0
> 

Thanks.

-- 
Dmitry
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