Re: [PATCH 05/12] drm/i915: Protect lockdep functions with #ifdef

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 08 Feb 2022, Namhyung Kim <namhyung@kernel.org> wrote:
> With upcoming lock tracepoints config, it'd define some of lockdep
> functions without enabling CONFIG_LOCKDEP actually.  The existing code
> assumes those functions will be removed by the preprocessor but it's
> not the case anymore.  Let's protect the code with #ifdef's explicitly.

I don't understand why you can't keep the no-op stubs for
CONFIG_LOCKDEP=n.

BR,
Jani.

>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
> Cc: intel-gfx@lists.freedesktop.org
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
>  drivers/gpu/drm/i915/intel_wakeref.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_wakeref.c b/drivers/gpu/drm/i915/intel_wakeref.c
> index dfd87d082218..6e4b8d036283 100644
> --- a/drivers/gpu/drm/i915/intel_wakeref.c
> +++ b/drivers/gpu/drm/i915/intel_wakeref.c
> @@ -106,8 +106,11 @@ void __intel_wakeref_init(struct intel_wakeref *wf,
>  	wf->wakeref = 0;
>  
>  	INIT_DELAYED_WORK(&wf->work, __intel_wakeref_put_work);
> +
> +#ifdef CONFIG_LOCKDEP
>  	lockdep_init_map(&wf->work.work.lockdep_map,
>  			 "wakeref.work", &key->work, 0);
> +#endif
>  }
>  
>  int intel_wakeref_wait_for_idle(struct intel_wakeref *wf)

-- 
Jani Nikula, Intel Open Source Graphics Center