linux-kernel - Re: [PATCH 06/15] input: touchscreen: melfas_mip4: Remove a bunch of unused variables

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Date:   Thu, 19 Nov 2020 19:09:01 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org, Sangwon Jee <jeesw@...fas.com>,
        Henrik Rydberg <rydberg@...math.org>,
        linux-input@...r.kernel.org
Subject: Re: [PATCH 06/15] input: touchscreen: melfas_mip4: Remove a bunch of
 unused variables

On Fri, Nov 13, 2020 at 07:55:25AM +0000, Lee Jones wrote:
> On Thu, 12 Nov 2020, Dmitry Torokhov wrote:
> 
> > On Thu, Nov 12, 2020 at 11:01:55AM +0000, Lee Jones wrote:
> > > Fixes the following W=1 kernel build warning(s):
> > > 
> > >  drivers/input/touchscreen/melfas_mip4.c: In function ‘mip4_report_touch’:
> > >  drivers/input/touchscreen/melfas_mip4.c:474:5: warning: variable ‘size’ set but not used [-Wunused-but-set-variable]
> > >  drivers/input/touchscreen/melfas_mip4.c:472:5: warning: variable ‘pressure_stage’ set but not used [-Wunused-but-set-variable]
> > >  drivers/input/touchscreen/melfas_mip4.c:469:7: warning: variable ‘palm’ set but not used [-Wunused-but-set-variable]
> > >  drivers/input/touchscreen/melfas_mip4.c:468:7: warning: variable ‘hover’ set but not used [-Wunused-but-set-variable]
> > > 
> > > Cc: Sangwon Jee <jeesw@...fas.com>
> > > Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > > Cc: Henrik Rydberg <rydberg@...math.org>
> > > Cc: linux-input@...r.kernel.org
> > > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > > ---
> > >  drivers/input/touchscreen/melfas_mip4.c | 11 -----------
> > >  1 file changed, 11 deletions(-)
> > > 
> > > diff --git a/drivers/input/touchscreen/melfas_mip4.c b/drivers/input/touchscreen/melfas_mip4.c
> > > index f67efdd040b24..9c98759098c7a 100644
> > > --- a/drivers/input/touchscreen/melfas_mip4.c
> > > +++ b/drivers/input/touchscreen/melfas_mip4.c
> > > @@ -465,13 +465,9 @@ static void mip4_report_keys(struct mip4_ts *ts, u8 *packet)
> > >  static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
> > >  {
> > >  	int id;
> > > -	bool hover;
> > > -	bool palm;
> > >  	bool state;
> > >  	u16 x, y;
> > > -	u8 pressure_stage = 0;
> > >  	u8 pressure;
> > > -	u8 size;
> > >  	u8 touch_major;
> > >  	u8 touch_minor;
> > >  
> > > @@ -480,14 +476,11 @@ static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
> > >  	case 1:
> > >  		/* Touch only */
> > >  		state = packet[0] & BIT(7);
> > > -		hover = packet[0] & BIT(5);
> > > -		palm = packet[0] & BIT(4);
> > 
> > No really happy that we'd be losing information about protocol. Is there
> > a better way to suppress the warning while keeping this info?
> 
> Yes.  We can either convert the information to comments, or mark the
> variables as __always_unused.

If __always unused suppresses this warning that would be my preference.

Thanks!

-- 
Dmitry