This patch makes pseries_idle_driver not to be registered when power_save=off kernel boot option is specified. The cpuidle_disable variable used here is similar to its usage on x86. If cpuidle_disable is set then sysfs entries for cpuidle framework are not created and the required drivers are not loaded.
Signed-off-by: Deepthi Dharwar <deep...@linux.vnet.ibm.com> Signed-off-by: Trinabh Gupta <g.trin...@gmail.com> Signed-off-by: Arun R Bharadwaj <arun.r.bharad...@gmail.com> --- arch/powerpc/include/asm/processor.h | 1 + arch/powerpc/platforms/pseries/processor_idle.c | 3 +++ 2 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index 811b7e7..b585bff 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -382,6 +382,7 @@ static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32) } #endif +extern unsigned long cpuidle_disable; enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF}; #endif /* __KERNEL__ */ diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c index 352b78a..4f59af0 100644 --- a/arch/powerpc/platforms/pseries/processor_idle.c +++ b/arch/powerpc/platforms/pseries/processor_idle.c @@ -269,6 +269,9 @@ static int pseries_idle_probe(void) if (!firmware_has_feature(FW_FEATURE_SPLPAR)) return -ENODEV; + if (cpuidle_disable != IDLE_NO_OVERRIDE) + return -ENODEV; + if (max_idle_state == 0) { printk(KERN_DEBUG "pseries processor idle disabled.\n"); return -EPERM; _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev