Using alabaster theme
WARNING: ./include/linux/fs.h:3288 function parameter 'name' not described in 'name_contains_dotdot'
WARNING: ./drivers/gpu/drm/amd/display/dc/dc.h:254 struct member 'num_rmcm_3dluts' not described in 'mpc_color_caps'
/home/doc-build/testing/Documentation/gpu/drm-kms:360: ./drivers/gpu/drm/drm_fourcc.c:397: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:35.
Declaration is '.. c:function:: const struct drm_format_info * drm_format_info (u32 format)'.
/home/doc-build/testing/Documentation/gpu/drm-kms:476: ./drivers/gpu/drm/drm_modeset_lock.c:377: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:48.
Declaration is '.. c:function:: int drm_modeset_lock (struct drm_modeset_lock *lock, struct drm_modeset_acquire_ctx *ctx)'.
/home/doc-build/testing/Documentation/gpu/drm-uapi:574: ./drivers/gpu/drm/drm_ioctl.c:915: WARNING: Duplicate C declaration, also defined at gpu/drm-uapi:69.
Declaration is '.. c:function:: bool drm_ioctl_flags (unsigned int nr, unsigned int *flags)'.
/home/doc-build/testing/Documentation/networking/netlink_spec/index.rst: WARNING: document isn't included in any toctree
Using alabaster theme
WARNING: ./include/linux/fs.h:3288 function parameter 'name' not described in 'name_contains_dotdot'
WARNING: ./drivers/gpu/drm/amd/display/dc/dc.h:254 struct member 'num_rmcm_3dluts' not described in 'mpc_color_caps'
/home/doc-build/testing/Documentation/gpu/drm-kms:360: ./drivers/gpu/drm/drm_fourcc.c:397: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:35.
Declaration is '.. c:function:: const struct drm_format_info * drm_format_info (u32 format)'.
/home/doc-build/testing/Documentation/gpu/drm-kms:476: ./drivers/gpu/drm/drm_modeset_lock.c:377: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:48.
Declaration is '.. c:function:: int drm_modeset_lock (struct drm_modeset_lock *lock, struct drm_modeset_acquire_ctx *ctx)'.
/home/doc-build/testing/Documentation/gpu/drm-uapi:574: ./drivers/gpu/drm/drm_ioctl.c:915: WARNING: Duplicate C declaration, also defined at gpu/drm-uapi:69.
Declaration is '.. c:function:: bool drm_ioctl_flags (unsigned int nr, unsigned int *flags)'.

Sphinx parallel build error:
KeyError: 'doc'
make[2]: *** [Documentation/Makefile:109: htmldocs] Error 2
make[1]: *** [/home/doc-build/testing/Makefile:1806: htmldocs] Error 2
make: *** [Makefile:248: __sub-make] Error 2