[PATCH 2/9] VC04_SERVICES: Add top level compat ioctl handler

[Dan Carpenter]

On Wed, Jan 18, 2017 at 11:37:55PM -0800, Michael Zoran wrote:
> This whole driver is a chicken and egg problem.  The existing code is
> so hard to read and maintain, that it's hard to improve it in a
> incremental way.   Yet, trowing large sections out the door is too hard
> to get seriously reviewed as well...
> 
> I would like to think that what I've submitted is an improvement on the
> existing stuff.  I'm sorry you feel that no changes are possible unless
>  all the issues are fixed at once.
> 

This isn't fixing existing code, it's adding new code.

So this morning, because you're asking me to reconsider this code, I
looked at it again and the function that I'm complaining about seems
totally useless.  It doesn't do *anything*!  I can't figure out what
it's for.  It also seems totally unused.  I told myself, that I must be
missing something critical hidden in macro magic, so I applied it and
compiled it and it gives me these warnings:

In file included from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:52:0:
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function ‘vchiq_ioctl_compat_internal’:
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h:185:38: warning: unused variable ‘debug_ptr’ [-Wunused-variable]
 #define DEBUG_INITIALISE(local) int *debug_ptr = (local)->debug;
                                      ^
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1222:2: note: in expansion of macro ‘DEBUG_INITIALISE’
  DEBUG_INITIALISE(g_state.local)
  ^
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: At top level:
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:1212:1: warning: ‘vchiq_ioctl_compat_internal’ defined but not used [-Wunused-function]
 vchiq_ioctl_compat_internal(
 ^
  LD [M]  drivers/staging/vc04_services/vchiq.o

I shouldn't have to review code like this when the compiler already
tells you it's unacceptable.

regards,
dan carpenter