Using alabaster theme
/home/doc-build/testing/Documentation/driver-api/usb/usb.rst:968: WARNING: Duplicate C declaration, also defined at driver-api/usb/gadget:804.
Declaration is '.. c:struct:: usb_string'.
/home/doc-build/testing/Documentation/gpu/drm-kms:360: ./drivers/gpu/drm/drm_fourcc.c:344: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:39.
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:392: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:49.
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:434: ./drivers/gpu/drm/drm_ioctl.c:875: WARNING: Duplicate C declaration, also defined at gpu/drm-uapi:70.
Declaration is '.. c:function:: bool drm_ioctl_flags (unsigned int nr, unsigned int *flags)'.
/home/doc-build/testing/Documentation/trace/debugging.rst: WARNING: document isn't included in any toctree

Sphinx parallel build error:
FileExistsError: [Errno 17] File exists: '/home/doc-build/testing/Documentation/output/_images'
make[2]: *** [Documentation/Makefile:122: htmldocs] Error 2
make[1]: *** [/home/doc-build/testing/Makefile:1720: htmldocs] Error 2
make: *** [Makefile:224: __sub-make] Error 2