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Documentation/x86: Update split lock documentation

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commit b041b525dab9 ("x86/split_lock: Make life miserable for split
lockers") added a delay and serialization of split locks. Commit
727209376f49 ("x86/split_lock: Add sysctl to control the misery mode")
provided a sysctl to turn off the misery.

Update the split lock documentation to describe the current state of
the code.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20230315225722.104607-1-tony.luck@intel.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Tony Luck 2023-03-15 15:57:22 -07:00 committed by Jonathan Corbet
parent 1aa63d4eb8
commit 054ed6349c
1 changed files with 8 additions and 2 deletions
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10
Documentation/x86/buslock.rst
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@ -53,8 +53,14 @@ parameter "split_lock_detect". Here is a summary of different options:
|off |Do nothing |Do nothing |
+------------------+----------------------------+-----------------------+
|warn |Kernel OOPs |Warn once per task and |
|(default) |Warn once per task and |and continues to run. |
| |disable future checking | |
|(default) |Warn once per task, add a |and continues to run. |
| |delay, add synchronization | |
| |to prevent more than one | |
| |core from executing a | |
| |split lock in parallel. | |
| |sysctl split_lock_mitigate | |
| |can be used to avoid the | |
| |delay and synchronization | |
| |When both features are | |
| |supported, warn in #AC | |
+------------------+----------------------------+-----------------------+