From f5899ff9c48d8f4dcfb1d622605d6ea2e0cf7eb9 Mon Sep 17 00:00:00 2001 From: Jinjie Ruan Date: Fri, 17 Apr 2026 11:25:40 +0800 Subject: [PATCH] docs: Update nosmt support for arm64 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 Signed-off-by: Jonathan Corbet Message-ID: <20260417032540.3720627-1-ruanjinjie@huawei.com> --- 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 b1e2e50d5c8d..8c22943e51c0 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4638,7 +4638,7 @@ 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.