linux-kernel - Re: [PATCH v1 2/2] Input: matrix_keypad - replace header inclusions by forward declarations

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Message-ID: <086d381d-bc6f-7dd3-35b6-d05afe742b9e@roeck-us.net>
Date:   Sat, 29 Oct 2022 16:02:56 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] Input: matrix_keypad - replace header inclusions
 by forward declarations

On 10/29/22 15:28, Dmitry Torokhov wrote:
> On Sat, Oct 29, 2022 at 07:25:51AM -0700, Guenter Roeck wrote:
>> On Fri, Sep 23, 2022 at 09:46:32PM +0300, Andy Shevchenko wrote:
>>> When the data structure is only referred by pointer, compiler may not need
>>> to see the contents of the data type. Thus, we may replace header inclusions
>>> by respective forward declarations.
>>>
>>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>> ---
>>>   include/linux/input/matrix_keypad.h | 5 +++--
>>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/include/linux/input/matrix_keypad.h b/include/linux/input/matrix_keypad.h
>>> index 9476768c3b90..b8d8d69eba29 100644
>>> --- a/include/linux/input/matrix_keypad.h
>>> +++ b/include/linux/input/matrix_keypad.h
>>> @@ -3,8 +3,9 @@
>>>   #define _MATRIX_KEYPAD_H
>>>   
>>>   #include <linux/types.h>
>>> -#include <linux/input.h>
>>
>> Possibly, but may other drivers rely on those includes.
>> This results in widespread build failures such as
>>
>> Building arm:allmodconfig ... failed
>> --------------
>> Error log:
>> In file included from include/linux/input/samsung-keypad.h:12,
>>                   from arch/arm/mach-s3c/keypad.h:12,
>>                   from arch/arm/mach-s3c/mach-crag6410.c:57:
>> arch/arm/mach-s3c/mach-crag6410.c:183:19: error: 'KEY_VOLUMEUP' undeclared here
> 
> I fixed this particular instance, hopefully it is one of the very
> last of them...
> 

Sorry, I didn't bother listing all of them. There is at least one more.

Error log:
arch/arm/mach-pxa/spitz.c:410:11: error: 'EV_PWR' undeclared here (not in a function)
   410 |   .type = EV_PWR,
       |           ^~~~~~

with arm:pxa_defconfig.

Guenter