Eric Lee / smarc-fsl-linux-kernel

20 Feb, 2019

1 commit

  • 4133b013f   lib/irq_poll: Support schedules in non-interrupt contexts ... Browse Code »

    Do not assume irq_poll_sched() is called from an interrupt context only.
    So use raise_softirq_irqoff() instead of __raise_softirq_irqoff() so it
    will kick the ksoftirqd if the schedule is from a non-interrupt context.

    This is required for RDMA drivers, like soft iwarp, that generate cq
    completion notifications in a workqueue or kthread context. Without this
    change, siw completion notifications to the ULP can take several hundred
    usecs, depending on the system load.

    Signed-off-by: Steve Wise
    Reviewed-by: Sagi Grimberg
    Signed-off-by: Jason Gunthorpe

    Steve Wise
     

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
     

16 Oct, 2016

1 commit

  • 9ffc66941   Merge tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux ... Browse Code »

    Pull gcc plugins update from Kees Cook:
    "This adds a new gcc plugin named "latent_entropy". It is designed to
    extract as much possible uncertainty from a running system at boot
    time as possible, hoping to capitalize on any possible variation in
    CPU operation (due to runtime data differences, hardware differences,
    SMP ordering, thermal timing variation, cache behavior, etc).

    At the very least, this plugin is a much more comprehensive example
    for how to manipulate kernel code using the gcc plugin internals"

    * tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
    latent_entropy: Mark functions with __latent_entropy
    gcc-plugins: Add latent_entropy plugin

    Linus Torvalds
     

11 Oct, 2016

1 commit

  • 0766f788e   latent_entropy: Mark functions with __latent_entropy ... Browse Code »

    The __latent_entropy gcc attribute can be used only on functions and
    variables. If it is on a function then the plugin will instrument it for
    gathering control-flow entropy. If the attribute is on a variable then
    the plugin will initialize it with random contents. The variable must
    be an integer, an integer array type or a structure with integer fields.

    These specific functions have been selected because they are init
    functions (to help gather boot-time entropy), are called at unpredictable
    times, or they have variable loops, each of which provide some level of
    latent entropy.

    Signed-off-by: Emese Revfy
    [kees: expanded commit message]
    Signed-off-by: Kees Cook

    Emese Revfy
     

20 Sep, 2016

1 commit

20 Jan, 2016

1 commit

  • 2ee177e94   irq_poll: Fix irq_poll_sched() ... Browse Code »

    The IRQ_POLL_F_SCHED bit is set as long as polling is ongoing.
    This means that irq_poll_sched() must proceed if this bit has
    not yet been set.

    Fixes: commit ea51190c0315 ("irq_poll: fold irq_poll_sched_prep into irq_poll_sched").
    Signed-off-by: Bart Van Assche
    Reviewed-by: Christoph Hellwig
    Reviewed-by: Sagi Grimberg
    Signed-off-by: Doug Ledford

    Bart Van Assche
     

12 Dec, 2015

5 commits