02 Nov, 2017

1 commit

  • 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
    Reviewed-by: Philippe Ombredanne
    Reviewed-by: Thomas Gleixner
    Signed-off-by: Greg Kroah-Hartman

    Greg Kroah-Hartman
     

14 May, 2017

1 commit

  • The default NetBSD package manager is pkgsrc and it installs Perl
    along other third party programs under custom and configurable prefix.
    The default prefix for binary prebuilt packages is /usr/pkg, and the
    Perl executable lands in /usr/pkg/bin/perl.

    This change switches "/usr/bin/perl" to "/usr/bin/env perl" as it's
    the most portable solution that should work for almost everybody.
    Perl's executable is detected automatically.

    This change switches -w option passed to the executable with more
    modern "use warnings;" approach. There is no functional change to the
    default behavior.

    While there, drop "require 5" from scripts/namespace.pl (Perl from 1994?).

    Signed-off-by: Kamil Rytarowski
    Signed-off-by: Masahiro Yamada

    Kamil Rytarowski
     

28 Aug, 2015

1 commit

  • This adds a simple perl script for reading two files as produced by
    the stackusage script and computing the changes in stack usage. For
    example:

    $ scripts/stackusage -o /tmp/old.su CC=gcc-4.7 -j8 fs/ext4/
    $ scripts/stackusage -o /tmp/new.su CC=gcc-5.0 -j8 fs/ext4/
    $ scripts/stackdelta /tmp/{old,new}.su | sort -k5,5g

    shows that gcc 5.0 generally produces less stack-hungry code than gcc
    4.7. Obviously, the script can also be used for measuring the effect
    of commits, .config tweaks or whatnot.

    Signed-off-by: Rasmus Villemoes
    Signed-off-by: Michal Marek

    Rasmus Villemoes