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powerpc/idle: Add support for nohlt 

This patch enables config option GENERIC_IDLE_POLL_SETUP for arch
powerpc. This adds support for kernel param 'nohlt'.

Powerpc kernel also supports another kernel boot-time param called
'powersave' which can also be used to disable all cpu idle-states and
forces CPU to an idle-loop similar to what cpu_idle_poll() does. This
patch however makes powerpc kernel-parameters better aligned to the
generic boot-time parameters.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230818050739.827851-1-vaibhav@linux.ibm.com
This commit is contained in:
Vaibhav Jain 2023-08-18 10:37:37 +05:30 committed by Michael Ellerman
parent b949ee6801
commit 0ceef6e99c
2 changed files with 2 additions and 1 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3717,7 +3717,7 @@
nohibernate [HIBERNATION] Disable hibernation and resume.
nohlt [ARM,ARM64,MICROBLAZE,MIPS,SH] Forces the kernel to
nohlt [ARM,ARM64,MICROBLAZE,MIPS,PPC,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

1
arch/powerpc/Kconfig
View File

@ -193,6 +193,7 @@ config PPC
select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
select GENERIC_EARLY_IOREMAP
select GENERIC_GETTIMEOFDAY
select GENERIC_IDLE_POLL_SETUP
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
select GENERIC_PCI_IOMAP if PCI