On linux-next ( next-2160706), following errors happen these days while running "make htmldocs" HTML Documentation/DocBook/device-drivers.html /home/iida/Repo/linux-next/Documentation/DocBook/device-drivers.aux.xml:28799: element refentry: validity error : ID API-reservation-object-reserve-shared already defined <refentry id="API-reservation-object-reserve-shared"> ^ /home/iida/Repo/linux-next/Documentation/DocBook/device-drivers.aux.xml:28849: element refentry: validity error : ID API-reservation-object-add-shared-fence already defined <refentry id="API-reservation-object-add-shared-fence"> As I bisect the issue, the first bad commit is following. commit 2cca45574007b4a77fa5f63ea45d664510cec22a Merge: bb4cec0222f9 e83950816367 Author: Dave Airlie <airlied@xxxxxxxxxx> Date: Thu Jun 9 11:19:28 2016 +1000 Merge tag 'topic/drm-misc-2016-06-07' of git://anongit.freedesktop.org/drm-intel into drm-next The actual change which cause this warning came from following. commit eae1760fc838d5f569a80939f72483f02ac049c5 Author: Rob Clark <robdclark@xxxxxxxxx> Date: Thu Mar 31 16:26:52 2016 -0400 doc: update/fixup dma-buf related DocBook Split out dma-buf related parts into their own section, add missing files, and write a bit of overview about how it all fits together. Signed-off-by: Rob Clark <robdclark@xxxxxxxxx> Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx> FYI, This issue does not exist on 4.7-rc6. Masanari Iida -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html