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
     

15 Jul, 2015

1 commit

  • 6ce12a977   PM / autosleep: Use workqueue for user space wakeup sources garbage collector ... Browse Code »

    The synchronous synchronize_rcu() in wakeup_source_remove() makes
    user process which writes to /sys/kernel/wake_unlock blocked sometimes.

    For example, when android eventhub tries to release a wakelock, this
    blocking process can occur, and eventhub can't get input events
    for a while.

    Using a work item instead of direct function call at pm_wake_unlock()
    can prevent this unnecessary delay from happening.

    Signed-off-by: SungEun Kim
    Signed-off-by: Rafael J. Wysocki

    SungEun Kim
     

01 Mar, 2014

1 commit

  • 6c5be2916   PM / wakeup: Include appropriate header file in kernel/power/wakelock.c ... Browse Code »

    Include appropriate header file kernel/power/power.h in
    kernel/power/wakelock.c because it has prototype declaration of function
    defined in kernel/power/wakelock.c.

    This eliminates the following warning in kernel/power/wakelock.c:
    kernel/power/wakelock.c:34:9: warning: no previous prototype for ‘pm_show_wakelocks’ [-Wmissing-prototypes]
    kernel/power/wakelock.c:184:5: warning: no previous prototype for ‘pm_wake_lock’ [-Wmissing-prototypes]
    kernel/power/wakelock.c:232:5: warning: no previous prototype for ‘pm_wake_unlock’ [-Wmissing-prototypes]

    Signed-off-by: Rashika Kheria
    Reviewed-by: Josh Triplett
    Signed-off-by: Rafael J. Wysocki

    Rashika Kheria
     

19 Jul, 2012

1 commit

12 May, 2012

2 commits

02 May, 2012

1 commit

  • b86ff9820   PM / Sleep: Add user space interface for manipulating wakeup sources, v3 ... Browse Code »

    Android allows user space to manipulate wakelocks using two
    sysfs file located in /sys/power/, wake_lock and wake_unlock.
    Writing a wakelock name and optionally a timeout to the wake_lock
    file causes the wakelock whose name was written to be acquired (it
    is created before is necessary), optionally with the given timeout.
    Writing the name of a wakelock to wake_unlock causes that wakelock
    to be released.

    Implement an analogous interface for user space using wakeup sources.
    Add the /sys/power/wake_lock and /sys/power/wake_unlock files
    allowing user space to create, activate and deactivate wakeup
    sources, such that writing a name and optionally a timeout to
    wake_lock causes the wakeup source of that name to be activated,
    optionally with the given timeout. If that wakeup source doesn't
    exist, it will be created and then activated. Writing a name to
    wake_unlock causes the wakeup source of that name, if there is one,
    to be deactivated. Wakeup sources created with the help of
    wake_lock that haven't been used for more than 5 minutes are garbage
    collected and destroyed. Moreover, there can be only WL_NUMBER_LIMIT
    wakeup sources created with the help of wake_lock present at a time.

    The data type used to track wakeup sources created by user space is
    called "struct wakelock" to indicate the origins of this feature.

    This version of the patch includes an rbtree manipulation fix from John Stultz.

    Signed-off-by: Rafael J. Wysocki
    Acked-by: Greg Kroah-Hartman
    Reviewed-by: NeilBrown

    Rafael J. Wysocki