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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt6
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 4c6d3dc775f7..aa408191e41a 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3958,7 +3958,11 @@
off - Unconditionally enable Speculative Store Bypass
auto - Kernel detects whether the CPU model contains an
implementation of Speculative Store Bypass and
- picks the most appropriate mitigation
+ picks the most appropriate mitigation.
+ prctl - Control Speculative Store Bypass per thread
+ via prctl. Speculative Store Bypass is enabled
+ for a process by default. The state of the control
+ is inherited on fork.
Not specifying this option is equivalent to
spec_store_bypass_disable=auto.