From: Jonathan Corbet <corbet@lwn.net>
To: Jinjie Ruan <ruanjinjie@huawei.com>,
skhan@linuxfoundation.org, akpm@linux-foundation.org,
bp@alien8.de, rdunlap@infradead.org, pmladek@suse.com,
pawan.kumar.gupta@linux.intel.com, feng.tang@linux.alibaba.com,
dapeng1.mi@linux.intel.com, kees@kernel.org, elver@google.com,
paulmck@kernel.org, lirongqing@baidu.com, safinaskar@gmail.com,
bhelgaas@google.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, skelley@nvidia.com
Cc: ruanjinjie@huawei.com
Subject: Re: [PATCH] docs: Update nosmt support for arm64
Date: Fri, 15 May 2026 08:26:51 -0600 [thread overview]
Message-ID: <871pfcrbo4.fsf@trenco.lwn.net> (raw)
In-Reply-To: <20260417032540.3720627-1-ruanjinjie@huawei.com>
Jinjie Ruan <ruanjinjie@huawei.com> writes:
> 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@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 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).
Applied, thanks.
jon
prev parent reply other threads:[~2026-05-15 14:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-17 3:25 [PATCH] docs: Update nosmt support for arm64 Jinjie Ruan
2026-05-11 6:17 ` Jinjie Ruan
2026-05-15 14:26 ` Jonathan Corbet [this message]
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