1. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      
      How this work was done:
      
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
         lines).
      
      All documentation files were explicitly excluded.
      
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
      
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
      
         For non */uapi/* files that summary was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0                                              11139
      
         and resulted in the first patch in this series.
      
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0 WITH Linux-syscall-note                        930
      
         and resulted in the second patch in this series.
      
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|------
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
         and that resulted in the third patch in this series.
      
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
      
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
      
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
      
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
      
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  2. 16 Nov, 2016 1 commit
  3. 25 Jun, 2016 1 commit
  4. 30 May, 2016 1 commit
  5. 13 May, 2016 1 commit
    • Arnd Bergmann's avatar
      ACPI / video: mark acpi_video_get_levels() inline · e4f35c13
      Arnd Bergmann authored
      A recent patch added a stub function for acpi_video_get_levels when
      CONFIG_ACPI_VIDEO is disabled. However, this is marked as 'static'
      and causes a warning about an unused function whereever the header
      gets included:
      
      In file included from ../drivers/gpu/drm/radeon/radeon_acpi.c:28:0:
      include/acpi/video.h:74:12: error: 'acpi_video_get_levels' defined but not used [-Werror=unused-function]
      
      This makes the declaration 'static inline', which gets rid of the
      warning.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 05950094 (ACPI/video: export acpi_video_get_levels)
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      e4f35c13
  6. 04 May, 2016 1 commit
  7. 15 Jan, 2016 1 commit
  8. 01 Jan, 2016 1 commit
    • Hans de Goede's avatar
      ACPI / video: Add a acpi_video_handles_brightness_key_presses() helper · 90b066b1
      Hans de Goede authored
      Several drivers want to know if the acpi-video is generating key-presses
      for brightness change hotkeys to avoid sending double key-events to
      userspace for these. Currently these driver use this construct for this:
      
      	if (acpi_video_get_backlight_type() == acpi_backlight_vendor)
      		report_brightness_key_event();
      
      This indirect way of detecting if acpi-video is active does not make the
      code easier to understand, and in some cases it is wrong because just
      because the preferred type != vendor does not mean that acpi-video is
      actually listening for brightness events, e.g. there may be no acpi-video
      bus on the system at all.
      
      This commit adds a acpi_video_handles_brightness_key_presses() helper
      function, making the code needing this functionality both easier to read
      and more correct.
      Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      90b066b1
  9. 15 Sep, 2015 1 commit
  10. 24 Jun, 2015 1 commit
  11. 18 Jun, 2015 3 commits
  12. 07 Jul, 2014 1 commit
  13. 20 May, 2014 1 commit
    • Hans de Goede's avatar
      ACPI / video: Add an acpi_video_unregister_backlight function · 1b7f37e1
      Hans de Goede authored
      Add an acpi_video_unregister_backlight function, which only unregisters
      the backlight device, and leaves the acpi_notifier in place. Some acpi_vendor
      driver need this as they don't want the acpi_video# backlight device, but do
      need the acpi-video driver for hotkey handling.
      
      Chances are that this new acpi_video_unregister_backlight() is actually
      what existing acpi_vendor drivers have wanted all along. Currently acpi_vendor
      drivers which want to disable the acpi_video# backlight device, make 2 calls:
      
      acpi_video_dmi_promote_vendor();
      acpi_video_unregister();
      
      The intention here is to make things independent of when acpi_video_register()
      gets called. As acpi_video_register() will get called on acpi-video load time
      on non intel gfx machines, while it gets called on i915 load time on intel
      gfx machines.
      
      This leads to the following 2 interesting scenarios:
      
       a) intel gfx:
        1) acpi-video module gets loaded (as it is a dependency of acpi_vendor
           and i915)
        2) acpi-video does NOT call acpi_video_register()
        3) acpi_vendor loads (lets assume it loads before i915), calls
           acpi_video_dmi_promote_vendor(); which sets
           ACPI_VIDEO_BACKLIGHT_DMI_VENDOR
        4) calls acpi_video_unregister -> not registered, nop
        5) i915 loads, calls acpi_video_register
        6) acpi_video_register registers the acpi_notifier for the hotkeys,
           does NOT register a backlight device because of
           ACPI_VIDEO_BACKLIGHT_DMI_VENDOR
      
       b) non intel gfx
        1) acpi-video module gets loaded (as it is a dependency acpi_vendor)
        2) acpi-video calls acpi_video_register()
        3) acpi_video_register registers the acpi_notifier for the hotkeys,
           and a backlight device
        4) acpi_vendor loads, calls acpi_video_dmi_promote_vendor()
        5) calls acpi_video_unregister, this unregisters BOTH the acpi_notifier
           for the hotkeys AND the backlight device
      
      So here we have possibly the same acpi_vendor module, making the same calls,
      but with different results, in one cases acpi-video does handle hotkeys,
      in the other it does not.
      
      Note that the a) scenario turns into b) if we assume the i915 module loads
      before the vendor_acpi module, so we also have different behavior depending
      on module loading order!
      
      So as said I believe that quite a few existing acpi_vendor modules really
      always want the behavior of a), hence this patch adds a new
      acpi_video_unregister_backlight() which gives the behavior of a) independent
      of module loading order.
      Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      1b7f37e1
  14. 26 Jul, 2013 1 commit
  15. 18 Jul, 2013 1 commit
    • Rafael J. Wysocki's avatar
      ACPI / video / i915: No ACPI backlight if firmware expects Windows 8 · 8c5bd7ad
      Rafael J. Wysocki authored
      According to Matthew Garrett, "Windows 8 leaves backlight control up
      to individual graphics drivers rather than making ACPI calls itself.
      There's plenty of evidence to suggest that the Intel driver for
      Windows [8] doesn't use the ACPI interface, including the fact that
      it's broken on a bunch of machines when the OS claims to support
      Windows 8.  The simplest thing to do appears to be to disable the
      ACPI backlight interface on these systems".
      
      There's a problem with that approach, however, because simply
      avoiding to register the ACPI backlight interface if the firmware
      calls _OSI for Windows 8 may not work in the following situations:
       (1) The ACPI backlight interface actually works on the given system
           and the i915 driver is not loaded (e.g. another graphics driver
           is used).
       (2) The ACPI backlight interface doesn't work on the given system,
           but there is a vendor platform driver that will register its
           own, equally broken, backlight interface if not prevented from
           doing so by the ACPI subsystem.
      Therefore we need to allow the ACPI backlight interface to be
      registered until the i915 driver is loaded which then will unregister
      it if the firmware has called _OSI for Windows 8 (or will register
      the ACPI video driver without backlight support if not already
      present).
      
      For this reason, introduce an alternative function for registering
      ACPI video, acpi_video_register_with_quirks(), that will check
      whether or not the ACPI video driver has already been registered
      and whether or not the backlight Windows 8 quirk has to be applied.
      If the quirk has to be applied, it will block the ACPI backlight
      support and either unregister the backlight interface if the ACPI
      video driver has already been registered, or register the ACPI
      video driver without the backlight interface otherwise.  Make
      the i915 driver use acpi_video_register_with_quirks() instead of
      acpi_video_register() in i915_driver_load().
      
      This change is based on earlier patches from Matthew Garrett,
      Chun-Yi Lee and Seth Forshee and includes a fix from Aaron Lu's.
      
      References: https://bugzilla.kernel.org/show_bug.cgi?id=51231Tested-by: default avatarAaron Lu <aaron.lu@intel.com>
      Tested-by: default avatarIgor Gnatenko <i.gnatenko.brain@gmail.com>
      Tested-by: default avatarYves-Alexis Perez <corsac@debian.org>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Reviewed-by: default avatarAaron Lu <aaron.lu@intel.com>
      Acked-by: default avatarMatthew Garrett <matthew.garrett@nebula.com>
      8c5bd7ad
  16. 13 Jul, 2011 1 commit
  17. 11 Dec, 2010 1 commit
  18. 19 Apr, 2010 1 commit
  19. 24 Jun, 2009 1 commit
  20. 17 Apr, 2009 1 commit
  21. 28 Mar, 2009 1 commit