[PATCH] docs: Update nosmt support for arm64

[Jinjie Ruan]

commit eed4583bcf9a6 ("arm64: Kconfig: Enable HOTPLUG_SMT") enable
HOTPLUG_SMT for SMT control for arm64, but the documentation was
not updated accordingly to reflect that ARM64 now supports control SMT
via boot parameter and sysfs knobs:

1. Boot parameters:

nosmt:          Disable SMT, can be enabled via sysfs knobs.
nosmt=force:    Disable SMT, cannot be enabled via sysfs knobs.

2. Runtime sysfs controls:

Write "on", "off", "forceoff" or the number of SMT threads (1, 2, ...)
to /sys/devices/system/cpu/smt/control.

Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
 Documentation/admin-guide/kernel-parameters.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index cb850e5290c2..6a73eb5abae9 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4661,7 +4661,7 @@ Kernel parameters
 	nosmt		[KNL,MIPS,PPC,EARLY] Disable symmetric multithreading (SMT).
 			Equivalent to smt=1.
 
-			[KNL,LOONGARCH,X86,PPC,S390] Disable symmetric multithreading (SMT).
+			[KNL,LOONGARCH,X86,ARM64,PPC,S390] Disable symmetric multithreading (SMT).
 			nosmt=force: Force disable SMT, cannot be undone
 				     via the sysfs control file.
 
-- 
2.34.1