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
     

21 Sep, 2016

1 commit

  • a4f1f9ac8   lib/win_minmax: windowed min or max estimator ... Browse Code »

    This commit introduces a generic library to estimate either the min or
    max value of a time-varying variable over a recent time window. This
    is code originally from Kathleen Nichols. The current form of the code
    is from Van Jacobson.

    A single struct minmax_sample will track the estimated windowed-max
    value of the series if you call minmax_running_max() or the estimated
    windowed-min value of the series if you call minmax_running_min().

    Nearly equivalent code is already in place for minimum RTT estimation
    in the TCP stack. This commit extracts that code and generalizes it to
    handle both min and max. Moving the code here reduces the footprint
    and complexity of the TCP code base and makes the filter generally
    available for other parts of the codebase, including an upcoming TCP
    congestion control module.

    This library works well for time series where the measurements are
    smoothly increasing or decreasing.

    Signed-off-by: Van Jacobson
    Signed-off-by: Neal Cardwell
    Signed-off-by: Yuchung Cheng
    Signed-off-by: Nandita Dukkipati
    Signed-off-by: Eric Dumazet
    Signed-off-by: Soheil Hassas Yeganeh
    Signed-off-by: David S. Miller

    Neal Cardwell