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diff --git a/Documentation/arch/arm64/sme.rst b/Documentation/arch/arm64/sme.rst
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+++ b/Documentation/arch/arm64/sme.rst
@@ -346,6 +346,10 @@ The regset data starts with struct user_za_header, containing:
* Writes to NT_ARM_ZT will set PSTATE.ZA to 1.
+* If any register data is provided along with SME_PT_VL_ONEXEC then the
+ registers data will be interpreted with the current vector length, not
+ the vector length configured for use on exec.
+
8. ELF coredump extensions
---------------------------