Re: [PATCH v4 3/4] drm: compile drm_vm.c only when needed

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Benjamin,

Thank you for the patch.

On Wednesday 07 Dec 2016 11:06:50 Benjamin Gaignard wrote:
> drm_vm.c functions are only need for DRM_LEGACY and DRM_NOUVEAU.
> Use a new DRM_VM to define when drm_vm.c in needed.
> 
> stub drm_legacy_vma_flush() to avoid compilation issues
> 
> version 4:
> - a "config DRM_VM" in Kconfig
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/gpu/drm/Kconfig         | 5 +++++
>  drivers/gpu/drm/Makefile        | 3 ++-
>  drivers/gpu/drm/drm_legacy.h    | 7 +++++++
>  drivers/gpu/drm/nouveau/Kconfig | 1 +
>  4 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 8d9cf73..83ac815 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -121,6 +121,10 @@ config DRM_KMS_CMA_HELPER
>  	help
>  	  Choose this if you need the KMS CMA helper functions
> 
> +config DRM_VM
> +	bool
> +	depends on DRM
> +
>  source "drivers/gpu/drm/i2c/Kconfig"
> 
>  source "drivers/gpu/drm/arm/Kconfig"
> @@ -246,6 +250,7 @@ source "drivers/gpu/drm/zte/Kconfig"
>  menuconfig DRM_LEGACY
>  	bool "Enable legacy drivers (DANGEROUS)"
>  	depends on DRM
> +	select DRM_VM
>  	help
>  	  Enable legacy DRI1 drivers. Those drivers expose unsafe and 
dangerous
>  	  APIs to user-space, which can be used to circumvent access
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index e10e935..5b73b16 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -5,7 +5,7 @@
>  drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
>  		drm_context.o drm_dma.o \
>  		drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \
> -		drm_lock.o drm_memory.o drm_drv.o drm_vm.o \
> +		drm_lock.o drm_memory.o drm_drv.o \
>  		drm_scatter.o drm_pci.o \
>  		drm_platform.o drm_sysfs.o drm_hashtab.o drm_mm.o \
>  		drm_crtc.o drm_fourcc.o drm_modes.o drm_edid.o \
> @@ -18,6 +18,7 @@ drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
>  		drm_plane.o drm_color_mgmt.o drm_print.o \
>  		drm_dumb_buffers.o drm_mode_config.o
> 
> +drm-$(CONFIG_DRM_VM) += drm_vm.o
>  drm-$(CONFIG_COMPAT) += drm_ioc32.o
>  drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
>  drm-$(CONFIG_PCI) += ati_pcigart.o
> diff --git a/drivers/gpu/drm/drm_legacy.h b/drivers/gpu/drm/drm_legacy.h
> index c6f422e..e4bb5ad 100644
> --- a/drivers/gpu/drm/drm_legacy.h
> +++ b/drivers/gpu/drm/drm_legacy.h
> @@ -74,7 +74,14 @@ int drm_legacy_getmap_ioctl(struct drm_device *dev, void
> *data, int drm_legacy_mapbufs(struct drm_device *d, void *v, struct
> drm_file *f); int drm_legacy_dma_ioctl(struct drm_device *d, void *v,
> struct drm_file *f);
> 
> +#ifdef CONFIG_DRM_VM
>  void drm_legacy_vma_flush(struct drm_device *d);
> +#else
> +static inline void drm_legacy_vma_flush(struct drm_device *d)
> +{
> +	/* do nothing */
> +}
> +#endif
> 
>  /*
>   * AGP Support
> diff --git a/drivers/gpu/drm/nouveau/Kconfig
> b/drivers/gpu/drm/nouveau/Kconfig index 2922a82..0f2f0af 100644
> --- a/drivers/gpu/drm/nouveau/Kconfig
> +++ b/drivers/gpu/drm/nouveau/Kconfig
> @@ -16,6 +16,7 @@ config DRM_NOUVEAU
>  	select INPUT if ACPI && X86
>  	select THERMAL if ACPI && X86
>  	select ACPI_VIDEO if ACPI && X86
> +	select DRM_VM
>  	help
>  	  Choose this option for open-source NVIDIA support.

-- 
Regards,

Laurent Pinchart

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