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    Subject[PATCH v7 16/21] x86/split_lock: Document the new sysfs file for split lock detection
    Date
    Add an ABI document entry for /sys/devices/system/cpu/split_lock_detect.

    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
    ---
    .../ABI/testing/sysfs-devices-system-cpu | 22 +++++++++++++++++++
    1 file changed, 22 insertions(+)

    diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
    index 9605dbd4b5b5..aad7b1698065 100644
    --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
    +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
    @@ -67,6 +67,28 @@ Description: Discover NUMA node a CPU belongs to
    /sys/devices/system/cpu/cpu42/node2 -> ../../node/node2


    +What: /sys/devices/system/cpu/split_lock_detect
    +Date: March 2019
    +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
    +Description: (RW) Control split lock detection on Intel Tremont and
    + future CPUs
    +
    + Reads return split lock detection status:
    + 0: disabled
    + 1: enabled
    +
    + Writes enable or disable split lock detection:
    + The first character is one of 'Nn0' or [oO][fF] for off
    + disables the feature.
    + The first character is one of 'Yy1' or [oO][nN] for on
    + enables the feature.
    +
    + Please note the interface only shows or controls global setting.
    + During run time, split lock detection on one CPU may be
    + disabled if split lock operation in kernel code happens on
    + the CPU. The interface doesn't show or control split lock
    + detection on individual CPU.
    +
    What: /sys/devices/system/cpu/cpu#/topology/core_id
    /sys/devices/system/cpu/cpu#/topology/core_siblings
    /sys/devices/system/cpu/cpu#/topology/core_siblings_list
    --
    2.19.1
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