Eric Lee / smarc-fsl-linux-kernel

02 Nov, 2017

1 commit

  • b24413180   License cleanup: add SPDX GPL-2.0 license identifier to files with no license ... Browse Code »

    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
     

10 Jan, 2015

4 commits

13 Nov, 2013

1 commit

17 Mar, 2011

1 commit

19 Jun, 2009

1 commit

  • 2521f2c22   gcov: add gcov profiling infrastructure ... Browse Code »

    Enable the use of GCC's coverage testing tool gcov [1] with the Linux
    kernel. gcov may be useful for:

    * debugging (has this code been reached at all?)
    * test improvement (how do I change my test to cover these lines?)
    * minimizing kernel configurations (do I need this option if the
    associated code is never run?)

    The profiling patch incorporates the following changes:

    * change kbuild to include profiling flags
    * provide functions needed by profiling code
    * present profiling data as files in debugfs

    Note that on some architectures, enabling gcc's profiling option
    "-fprofile-arcs" for the entire kernel may trigger compile/link/
    run-time problems, some of which are caused by toolchain bugs and
    others which require adjustment of architecture code.

    For this reason profiling the entire kernel is initially restricted
    to those architectures for which it is known to work without changes.
    This restriction can be lifted once an architecture has been tested
    and found compatible with gcc's profiling. Profiling of single files
    or directories is still available on all platforms (see config help
    text).

    [1] http://gcc.gnu.org/onlinedocs/gcc/Gcov.html

    Signed-off-by: Peter Oberparleiter
    Cc: Andi Kleen
    Cc: Huang Ying
    Cc: Li Wei
    Cc: Michael Ellerman
    Cc: Ingo Molnar
    Cc: Heiko Carstens
    Cc: Martin Schwidefsky
    Cc: Rusty Russell
    Cc: WANG Cong
    Cc: Sam Ravnborg
    Cc: Jeff Dike
    Cc: Al Viro
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Peter Oberparleiter