From a2f31d87518d03cb8424fd80033d29f9708f2305 Mon Sep 17 00:00:00 2001 From: Fenghua Yu Date: Mon, 19 Apr 2021 21:49:57 +0000 Subject: [PATCH] Documentation/admin-guide: Add bus lock ratelimit mainline inclusion from mainline-v5.12-rc4 commit 9d839c280b64817345c2fa462c0027a9bd742361 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5G10C CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ commit/?id=9d839c280b64817345c2fa462c0027a9bd742361 Intel-SIG: commit 9d839c 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 Signed-off-by: Thomas Gleixner Reviewed-by: Tony Luck Link: https://lore.kernel.org/r/20210419214958.4035512-4-fenghua.yu@intel.com (cherry picked from commit 9d839c280b64817345c2fa462c0027a9bd742361) Signed-off-by: Ethan Zhao Signed-off-by: Jason Zeng --- Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a7c23eff72e7..208d7b94aec6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5301,6 +5301,14 @@ 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" -- GitLab