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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index ecc74fa4bfde..92435e7c5f55 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2538,6 +2538,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nohugeiomap [KNL,x86] Disable kernel huge I/O mappings.
+ nosmt [KNL,S390] Disable symmetric multithreading (SMT).
+ Equivalent to smt=1.
+
noxsave [BUGS=X86] Disables x86 extended register state save
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
@@ -3695,6 +3698,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
1: Fast pin select (default)
2: ATC IRMode
+ smt [KNL,S390] Set the maximum number of threads (logical
+ CPUs) to use per physical CPU on systems capable of
+ symmetric multithreading (SMT). Will be capped to the
+ actual hardware limit.
+ Format: <integer>
+ Default: -1 (no limit)
+
softlockup_panic=
[KNL] Should the soft-lockup detector generate panics.
Format: <integer>