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
     

18 Jun, 2015

1 commit

06 Sep, 2013

1 commit

  • fd2ed4d25   dm: add statistics support ... Browse Code »

    Support the collection of I/O statistics on user-defined regions of
    a DM device. If no regions are defined no statistics are collected so
    there isn't any performance impact. Only bio-based DM devices are
    currently supported.

    Each user-defined region specifies a starting sector, length and step.
    Individual statistics will be collected for each step-sized area within
    the range specified.

    The I/O statistics counters for each step-sized area of a region are
    in the same format as /sys/block/*/stat or /proc/diskstats but extra
    counters (12 and 13) are provided: total time spent reading and
    writing in milliseconds. All these counters may be accessed by sending
    the @stats_print message to the appropriate DM device via dmsetup.

    The creation of DM statistics will allocate memory via kmalloc or
    fallback to using vmalloc space. At most, 1/4 of the overall system
    memory may be allocated by DM statistics. The admin can see how much
    memory is used by reading
    /sys/module/dm_mod/parameters/stats_current_allocated_bytes

    See Documentation/device-mapper/statistics.txt for more details.

    Signed-off-by: Mikulas Patocka
    Signed-off-by: Mike Snitzer
    Signed-off-by: Alasdair G Kergon

    Mikulas Patocka