Re: [RFC PATCH 4/7] drm/i915/pxp: fix undefined reference to `intel_pxp_gsccs_is_ready_for_sessions'

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

On Fri, 11 Apr 2025, Chen Linxuan <chenlinxuan@uniontech.com> wrote:
> On x86_64 with gcc version 13.3.0, I compile kernel with:
>
>   make defconfig
>   ./scripts/kconfig/merge_config.sh .config <(
>     echo CONFIG_COMPILE_TEST=y
>   )
>   make KCFLAGS="-fno-inline-functions -fno-inline-small-functions -fno-inline-functions-called-once"

The change looks good, but I'm guessing the real explanation is that you
have CONFIG_DRM_I915_PXP=n and that appears to be broken.

Fixes: 99afb7cc8c44 ("drm/i915/pxp: Add ARB session creation and cleanup")
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

But how do you want this merged?


BR,
Jani.

>
> Then I get a linker error:
>
>   ld: vmlinux.o: in function `pxp_fw_dependencies_completed':
>   kintel_pxp.c:(.text+0x95728f): undefined reference to `intel_pxp_gsccs_is_ready_for_sessions'
>
> Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com>
> ---
>  drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
> index 9aae779c4da3..4969d3de2bac 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
> @@ -23,6 +23,7 @@ int intel_pxp_gsccs_init(struct intel_pxp *pxp);
>  
>  int intel_pxp_gsccs_create_session(struct intel_pxp *pxp, int arb_session_id);
>  void intel_pxp_gsccs_end_arb_fw_session(struct intel_pxp *pxp, u32 arb_session_id);
> +bool intel_pxp_gsccs_is_ready_for_sessions(struct intel_pxp *pxp);
>  
>  #else
>  static inline void intel_pxp_gsccs_fini(struct intel_pxp *pxp)
> @@ -34,8 +35,11 @@ static inline int intel_pxp_gsccs_init(struct intel_pxp *pxp)
>  	return 0;
>  }
>  
> -#endif
> +static inline bool intel_pxp_gsccs_is_ready_for_sessions(struct intel_pxp *pxp)
> +{
> +	return false;
> +}
>  
> -bool intel_pxp_gsccs_is_ready_for_sessions(struct intel_pxp *pxp);
> +#endif
>  
>  #endif /*__INTEL_PXP_GSCCS_H__ */

-- 
Jani Nikula, Intel