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SubjectRe: [PATCH] Documentation/admin-guide: kernel-parameters: Update nohlt section
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On 2/8/21 4:30 PM, Florian Fainelli wrote:
> Update the documentation regarding "nohlt" and indicate that it is not
> only for bugs, but can be useful to disable the architecture specific
> sleep instructions. ARM, ARM64, SuperH and Microblaze all use
> CONFIG_GENERIC_IDLE_POLL_SETUP which takes care of honoring the
> "hlt"/"nohlt" parameters.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index a10b545c2070..83c37e23e1e2 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -3266,9 +3266,14 @@
> parameter, xsave area per process might occupy more
> memory on xsaves enabled systems.
>
> - nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
> - wfi(ARM) instruction doesn't work correctly and not to
> - use it. This is also useful when using JTAG debugger.
> + nohlt [ARM,ARM64,MICROBLAZE,SH] Forces the kernel to busy wait
> + in do_idle() and not use the arch_cpu_idle()
> + implementation, requires CONFIG_GENERIC_IDLE_POLL_SETUP

Sounds good... but above, I would prefer s/,/;/

> + to be effective. This is useful on platforms where the
> + sleep(SH) or wfi(ARM,ARM64) instructions do not work
> + correctly or when doing power measurements to evalute
> + the impact of the sleep instructions. This is also
> + useful when using JTAG debugger.
>
> no_file_caps Tells the kernel not to honor file capabilities. The
> only way then for a file to be executed with privilege
>

Acked-by: Randy Dunlap <rdunlap@infradead.org>

thanks.

--
~Randy

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