linux-kernel - Re: [PATCH 10/19] drm/radeon/radeon: Move prototype into shared header

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Message-ID: <20201109110603.GV2063125@dell>
Date:   Mon, 9 Nov 2020 11:06:03 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org,
        Christian König <christian.koenig@....com>,
        linaro-mm-sig@...ts.linaro.org, dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH 10/19] drm/radeon/radeon: Move prototype into shared
 header

On Sat, 07 Nov 2020, Sam Ravnborg wrote:

> Hi Lee,
> 
> On Fri, Nov 06, 2020 at 09:49:40PM +0000, Lee Jones wrote:
> > Unfortunately, a suitable one didn't already exist.
> > 
> > Fixes the following W=1 kernel build warning(s):
> > 
> >  drivers/gpu/drm/radeon/radeon_device.c:637:6: warning: no previous prototype for ‘radeon_device_is_virtual’ [-Wmissing-prototypes]
> >  637 | bool radeon_device_is_virtual(void)
> >  | ^~~~~~~~~~~~~~~~~~~~~~~~
> > 
> > Cc: Alex Deucher <alexander.deucher@....com>
> > Cc: "Christian König" <christian.koenig@....com>
> > Cc: David Airlie <airlied@...ux.ie>
> > Cc: Daniel Vetter <daniel@...ll.ch>
> > Cc: Sumit Semwal <sumit.semwal@...aro.org>
> > Cc: amd-gfx@...ts.freedesktop.org
> > Cc: dri-devel@...ts.freedesktop.org
> > Cc: linux-media@...r.kernel.org
> > Cc: linaro-mm-sig@...ts.linaro.org
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/gpu/drm/radeon/radeon_device.c |  1 +
> >  drivers/gpu/drm/radeon/radeon_device.h | 32 ++++++++++++++++++++++++++
> >  drivers/gpu/drm/radeon/radeon_drv.c    |  3 +--
> >  3 files changed, 34 insertions(+), 2 deletions(-)
> >  create mode 100644 drivers/gpu/drm/radeon/radeon_device.h
> 
> Other public functions in radeon_device.c have their prototype in
> radeon.h - for example radeon_is_px()
> 
> Add radeon_device_is_virtual() there so we avoiid this new header.

Oh yes, I remember why this wasn't a suitable solution now:

The macro "radeon_init" in radeon.h clashes with the init function of
the same name in radeon_drv.c:

  In file included from drivers/gpu/drm/radeon/radeon_drv.c:53:
  drivers/gpu/drm/radeon/radeon_drv.c:620:31: error: expected identifier or ‘(’ before ‘void’
  620 | static int __init radeon_init(void)
  | ^~~~
  drivers/gpu/drm/radeon/radeon.h:2705:28: note: in definition of macro ‘radeon_init’
  2705 | #define radeon_init(rdev) (rdev)->asic->init((rdev))
  | ^~~~
  In file included from drivers/gpu/drm/radeon/radeon_drv.c:35:
  drivers/gpu/drm/radeon/radeon_drv.c: In function ‘__inittest’:
  drivers/gpu/drm/radeon/radeon_drv.c:653:13: error: ‘radeon_init’ undeclared (first use in this function); did you mean ‘radeon_exit’?
  653 | module_init(radeon_init);
  | ^~~~~~~~~~~
  include/linux/module.h:133:11: note: in definition of macro ‘module_init’
  133 | { return initfn; } | ^~~~~~
  drivers/gpu/drm/radeon/radeon_drv.c:653:13: note: each undeclared identifier is reported only once for each function it appears in
  653 | module_init(radeon_init);
  | ^~~~~~~~~~~
  include/linux/module.h:133:11: note: in definition of macro ‘module_init’
  133 | { return initfn; } | ^~~~~~
  In file included from include/linux/compiler_types.h:65,
  from <command-line>:
  drivers/gpu/drm/radeon/radeon_drv.c: At top level:
  drivers/gpu/drm/radeon/radeon_drv.c:653:13: error: ‘radeon_init’ undeclared here (not in a function); did you mean ‘radeon_exit’?
  653 | module_init(radeon_init);
  | ^~~~~~~~~~~
  include/linux/compiler_attributes.h:109:65: note: in definition of macro ‘__copy’
  109 | # define __copy(symbol) __attribute__((__copy__(symbol)))
  | ^~~~~~
  drivers/gpu/drm/radeon/radeon_drv.c:653:1: note: in expansion of macro ‘module_init’
  653 | module_init(radeon_init);
  | ^~~~~~~~~~~
  In file included from drivers/gpu/drm/radeon/radeon_drv.c:35:
  include/linux/module.h:134:6: error: ‘init_module’ aliased to undefined symbol ‘radeon_init’
  134 | int init_module(void) __copy(initfn) __attribute__((alias(#initfn)));
  | ^~~~~~~~~~~
  drivers/gpu/drm/radeon/radeon_drv.c:653:1: note: in expansion of macro ‘module_init’
  653 | module_init(radeon_init);
  | ^~~~~~~~~~~

How would you like me to move forward?

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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