From 0ceef6e99cc3a57f33b84dafc6df5dfb3b28278d Mon Sep 17 00:00:00 2001 From: Vaibhav Jain Date: Fri, 18 Aug 2023 10:37:37 +0530 Subject: [PATCH] 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 Signed-off-by: Michael Ellerman Link: https://msgid.link/20230818050739.827851-1-vaibhav@linux.ibm.com --- Documentation/admin-guide/kernel-parameters.txt | 2 +- arch/powerpc/Kconfig | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cac464386779..fd9f21b49582 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -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 diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index b7a4cb5d9409..cb0a89946c4e 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -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