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

[Dmitry Torokhov]

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@xxxxxxxxxxxxxxx>
> > ---
> >  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...

-- 
Dmitry