linux-kernel - Re: [PATCH v3 09/11] Input: alps - remove unlikely() from IS

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Date:   Sat, 31 Aug 2019 17:25:00 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-input@...r.kernel.org
Subject: Re: [PATCH v3 09/11] Input: alps - remove unlikely() from IS_ERR*()
 condition

On Thursday 29 August 2019 10:50:39 Dmitry Torokhov wrote:
> On Thu, Aug 29, 2019 at 07:50:23PM +0300, Denis Efremov wrote:
> > "unlikely(IS_ERR_OR_NULL(x))" is excessive. IS_ERR_OR_NULL() already uses
> > unlikely() internally.
> 
> The keyword here is _internally_.
> 
> https://lore.kernel.org/lkml/20190821174857.GD76194@dtor-ws/
> 
> So please no.

Dmitry and I already rejected this patch, see also linked-list:
https://lore.kernel.org/lkml/20190820111719.7blyk5jstgwde2ae@pali/

> > 
> > Signed-off-by: Denis Efremov <efremov@...ux.com>
> > Cc: "Pali Rohár" <pali.rohar@...il.com>
> > Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > Cc: Joe Perches <joe@...ches.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: linux-input@...r.kernel.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 34700eda0429..ed1661434899 100644
> > --- a/drivers/input/mouse/alps.c
> > +++ b/drivers/input/mouse/alps.c
> > @@ -1476,7 +1476,7 @@ 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,
> > -- 
> > 2.21.0
> > 
> 

-- 
Pali Rohár
pali.rohar@...il.com

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