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  1. 06 Mar, 2019 1 commit
    • Jonathan Corbet's avatar
      docs: Bring some order to filesystem documentation · 4064174b
      Jonathan Corbet authored 
      Documentation/filesystems is, like much of the rest of the kernel's
documentation, a jumble of unorganized information.  Split the
documentation into categories and try to bring some order to the top-level
index.rst files.  No text changes other than a few section-introductory
blurbs; this is all just moving stuff around.

Cc: linux-fsdevel@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      4064174b
  3. 04 Mar, 2019 4 commits
  5. 22 Feb, 2019 9 commits
  7. 17 Feb, 2019 8 commits
  9. 11 Feb, 2019 5 commits
    • Federico Vaga's avatar
      doc:dmaengine: clarify DMA desc. pointer after submission · db693ade
      Federico Vaga authored 
      It clarifies that the DMA description pointer returned by
`dmaengine_prep_*` function should not be used after submission.
Signed-off-by: default avatarFederico Vaga <federico.vaga@cern.ch>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      db693ade
    • Jonathan Neuschäfer's avatar
      docs: process: Remove outdated info about -git patches · 2c71d305
      Jonathan Neuschäfer authored 
      As can be seen by clicking around the timeline on web.archive.org[1],
there were no -git patches/tarballs on kernel.org since release 3.1.

[1]: https://web.archive.org/web/20111103073843/http://www.kernel.org/Signed-off-by: default avatarJonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      2c71d305
    • Randy Dunlap's avatar
      Documentation: fix lg-laptop.rst warnings · c9389ad8
      Randy Dunlap authored 
      Fix markup warnings by inserting blank lines.
Also correct one typo.

Documentation/laptops/lg-laptop.rst:2: WARNING: Explicit markup ends without a blank line; unexpected unindent.
Documentation/laptops/lg-laptop.rst:16: WARNING: Unexpected indentation.
Documentation/laptops/lg-laptop.rst:17: WARNING: Block quote ends without a blank line; unexpected unindent.
Signed-off-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Cc: Matan Ziv-Av <matan@svgalib.org>
Acked-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      c9389ad8
    • Christoph Hellwig's avatar
      Documentation/DMA-ISA-LPC: fix an incorrect reference · 9a065fa8
      Christoph Hellwig authored 
      AFAIK we never had a isa_virt_to_phys, it always was
isa_virt_to_bus.
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      9a065fa8
    • Thomas Gleixner's avatar
      module: Cure the MODULE_LICENSE "GPL" vs. "GPL v2" bogosity · bf7fbeea
      Thomas Gleixner authored 
      The original MODULE_LICENSE string for kernel modules licensed under the
GPL v2 (only / or later) was simply "GPL", which was - and still is -
completely sufficient for the purpose of module loading and checking
whether the module is free software or proprietary.

In January 2003 this was changed with commit 3344ea3a ("[PATCH]
MODULE_LICENSE and EXPORT_SYMBOL_GPL support"). This commit can be found in
the history git repository which holds the 1:1 import of Linus' bitkeeper
repository:

  https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/?id=3344ea3ad4b7c302c846a680dbaeedf96ed45c02

The main intention of the patch was to refuse linking proprietary modules
against symbols exported with EXPORT_SYMBOL_GPL() at module load time.

As a completely undocumented side effect it also introduced the distinction
between "GPL" and "GPL v2" MODULE_LICENSE() strings:

 *      "GPL"                           [GNU Public License v2 or later]
 *      "GPL v2"                        [GNU Public License v2]
 *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 *      "Dual BSD/GPL"                  [GNU Public License v2
 *                                       or BSD license choice]
 *      "Dual MPL/GPL"                  [GNU Public License v2
 *                                       or Mozilla license choice]

This distinction was and still is wrong in several aspects:

 1) It broke all modules which were using the "GPL" string in the
    MODULE_LICENSE() already and were licensed under GPL v2 only.

    A quick license scan over the tree at that time shows that at least 480
    out of 1484 modules have been affected by this change back then. The
    number is probably way higher as this was just a quick check for
    clearly identifiable license information.

    There was exactly ONE instance of a "GPL v2" module license string in
    the kernel back then - drivers/net/tulip/xircom_tulip_cb.c which
    otherwise had no license information at all. There is no indication
    that the change above is any way related to this driver. The change
    happend with the 2.4.11 release which was on Oct. 9 2001 - so quite
    some time before the above commit. Unfortunately there is no trace on
    the intertubes to any discussion of this.

 2) The dual licensed strings became ill defined as well because following
    the "GPL" vs. "GPL v2" distinction all dual licensed (or additional
    rights) MODULE_LICENSE strings would either require those dual licensed
    modules to be licensed under GPL v2 or later or just be unspecified for
    the dual licensing case. Neither choice is coherent with the GPL
    distinction.

Due to the lack of a proper changelog and no real discussion on the patch
submission other than a few implementation details, it's completely unclear
why this distinction was introduced at all. Other than the comment in the
module header file exists no documentation for this at all.

From a license compliance and license scanning POV this distinction is a
total nightmare.

As of 5.0-rc2 2873 out of 9200 instances of MODULE_LICENSE() strings are
conflicting with the actual license in the source code (either SPDX or
license boilerplate/reference). A comparison between the scan of the
history tree and a scan of current Linus tree shows to the extent that the
git rename detection over Linus tree grafted with the history tree is
halfways complete that almost none of the files which got broken in 2003
have been cleaned up vs. the MODULE_LICENSE string. So subtracting those
480 known instances from the conflicting 2800 of today more than 25% of the
module authors got it wrong and it's a high propability that a large
portion of the rest just got it right by chance.

There is no value for the module loader to convey the detailed license
information as the only decision to be made is whether the module is free
software or not.

The "and additional rights", "BSD" and "MPL" strings are not conclusive
license information either. So there is no point in trying to make the GPL
part conclusive and exact. As shown above it's already non conclusive for
dual licensing and incoherent with a large portion of the module source.

As an unintended side effect this distinction causes a major headache for
license compliance, license scanners and the ongoing effort to clean up the
license mess of the kernel.

Therefore remove the well meant, but ill defined, distinction between "GPL"
and "GPL v2" and document that:

  - "GPL" and "GPL v2" both express that the module is licensed under GPLv2
    (without a distinction of 'only' and 'or later') and is therefore kernel
    license compliant.

  - None of the MODULE_LICENSE strings can be used for expressing or
    determining the exact license

  - Their sole purpose is to decide whether the module is free software or
    not.

Add a MODULE_LICENSE subsection to the license rule documentation as well.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
Acked-by: default avatarJoe Perches <joe@perches.com>
[jc: Did s/merily/merely/ ]
Acked-by: default avatarJessica Yu <jeyu@kernel.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      bf7fbeea
  11. 07 Feb, 2019 3 commits
  13. 06 Feb, 2019 2 commits
  15. 01 Feb, 2019 8 commits
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