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Documentation/admin-guide: kernel-parameters: Update nohlt section 

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>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210209172349.2249596-1-f.fainelli@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Florian Fainelli 2021-02-09 09:23:48 -08:00 committed by Jonathan Corbet
parent a15cb2c165
commit 3cae85f5f9
1 changed files with 8 additions and 3 deletions
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11
Documentation/admin-guide/kernel-parameters.txt
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@ -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
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