Documentation/admin-guide: Add bus lock ratelimit

Since bus lock rate limit changes the split_lock_detect parameter,
update the documentation for the change.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20210419214958.4035512-4-fenghua.yu@intel.com

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index cb89dbd..ca94624 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5283,6 +5283,14 @@
                                  exception. Default behavior is by #AC if
                                  both features are enabled in hardware.
 
+                       ratelimit:N -
+                                 Set system wide rate limit to N bus locks
+                                 per second for bus lock detection.
+                                 0 < N <= 1000.
+
+                                 N/A for split lock detection.
+
+
                        If an #AC exception is hit in the kernel or in
                        firmware (i.e. not while executing in user mode)
                        the kernel will oops in either "warn" or "fatal"