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
     

09 Sep, 2015

3 commits

25 Jun, 2015

1 commit

  • fc6daaf93   mm/memblock: add extra "flags" to memblock to allow selection of memory based on attribute ... Browse Code »

    Some high end Intel Xeon systems report uncorrectable memory errors as a
    recoverable machine check. Linux has included code for some time to
    process these and just signal the affected processes (or even recover
    completely if the error was in a read only page that can be replaced by
    reading from disk).

    But we have no recovery path for errors encountered during kernel code
    execution. Except for some very specific cases were are unlikely to ever
    be able to recover.

    Enter memory mirroring. Actually 3rd generation of memory mirroing.

    Gen1: All memory is mirrored
    Pro: No s/w enabling - h/w just gets good data from other side of the
    mirror
    Con: Halves effective memory capacity available to OS/applications

    Gen2: Partial memory mirror - just mirror memory begind some memory controllers
    Pro: Keep more of the capacity
    Con: Nightmare to enable. Have to choose between allocating from
    mirrored memory for safety vs. NUMA local memory for performance

    Gen3: Address range partial memory mirror - some mirror on each memory
    controller
    Pro: Can tune the amount of mirror and keep NUMA performance
    Con: I have to write memory management code to implement

    The current plan is just to use mirrored memory for kernel allocations.
    This has been broken into two phases:

    1) This patch series - find the mirrored memory, use it for boot time
    allocations

    2) Wade into mm/page_alloc.c and define a ZONE_MIRROR to pick up the
    unused mirrored memory from mm/memblock.c and only give it out to
    select kernel allocations (this is still being scoped because
    page_alloc.c is scary).

    This patch (of 3):

    Add extra "flags" to memblock to allow selection of memory based on
    attribute. No functional changes

    Signed-off-by: Tony Luck
    Cc: Xishi Qiu
    Cc: Hanjun Guo
    Cc: Xiexiuqi
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: "H. Peter Anvin"
    Cc: Yinghai Lu
    Cc: Naoya Horiguchi
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Tony Luck
     

15 Apr, 2015

2 commits

  • 7f70baeeb   memtest: use phys_addr_t for physical addresses ... Browse Code »

    Since memtest might be used by other architectures pass input parameters
    as phys_addr_t instead of long to prevent overflow.

    Signed-off-by: Vladimir Murzin
    Acked-by: Will Deacon
    Tested-by: Mark Rutland
    Cc: "H. Peter Anvin"
    Cc: Catalin Marinas
    Cc: Ingo Molnar
    Cc: Russell King
    Cc: Thomas Gleixner
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Vladimir Murzin
     
  • 4a20799d1   mm: move memtest under mm ... Browse Code »

    Memtest is a simple feature which fills the memory with a given set of
    patterns and validates memory contents, if bad memory regions is detected
    it reserves them via memblock API. Since memblock API is widely used by
    other architectures this feature can be enabled outside of x86 world.

    This patch set promotes memtest to live under generic mm umbrella and
    enables memtest feature for arm/arm64.

    It was reported that this patch set was useful for tracking down an issue
    with some errant DMA on an arm64 platform.

    This patch (of 6):

    There is nothing platform dependent in the core memtest code, so other
    platforms might benefit from this feature too.

    [linux@roeck-us.net: MEMTEST depends on MEMBLOCK]
    Signed-off-by: Vladimir Murzin
    Acked-by: Will Deacon
    Tested-by: Mark Rutland
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: "H. Peter Anvin"
    Cc: Catalin Marinas
    Cc: Russell King
    Cc: Paul Bolle
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Vladimir Murzin