It is useful for development and debugging to document the new debugfs interface /sys/kernel/debug/x86/split_lock_detect. A new debugfs documentation is created to describe the split lock detection interface. In the future, more entries may be added in the documentation to describe other interfaces under /sys/kernel/debug/x86 directory. Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx> --- Documentation/ABI/testing/debugfs-x86 | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 Documentation/ABI/testing/debugfs-x86 diff --git a/Documentation/ABI/testing/debugfs-x86 b/Documentation/ABI/testing/debugfs-x86 new file mode 100644 index 000000000000..17a1e9ed6712 --- /dev/null +++ b/Documentation/ABI/testing/debugfs-x86 @@ -0,0 +1,21 @@ +What: /sys/kernel/debugfs/x86/split_lock_detect +Date: May 2019 +Contact: Linux kernel mailing list <linux-kernel@xxxxxxxxxxxxxxx> +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. -- 2.19.1
