This patch makes pseries_idle_driver to be not registered when
power_save=off kernel boot option is specified. For this
boot_option_idle_override is used similar to how it is used for x86.
Signed-off-by: Trinabh Gupta <trinabh@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Arun R Bharadwaj <arun@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/processor.h | 3 +++
arch/powerpc/kernel/idle.c | 4 ++++
arch/powerpc/platforms/pseries/processor_idle.c | 4 ++++
3 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index d50c2b6..0ce167e 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -377,6 +377,9 @@ static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
}
#endif
+extern unsigned long boot_option_idle_override;
+enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PROCESSOR_H */
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index 932392b..61515f4 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -39,9 +39,13 @@
#define cpu_should_die() 0
#endif
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
+EXPORT_SYMBOL(boot_option_idle_override);
+
static int __init powersave_off(char *arg)
{
ppc_md.power_save = NULL;
+ boot_option_idle_override = IDLE_POWERSAVE_OFF;
return 0;
}
__setup("powersave=off", powersave_off);
diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c
index ff44b49..c4c3383 100644
--- a/arch/powerpc/platforms/pseries/processor_idle.c
+++ b/arch/powerpc/platforms/pseries/processor_idle.c
@@ -288,6 +288,10 @@ static int pseries_idle_probe(void)
return -EPERM;
}
+ if (boot_option_idle_override != IDLE_NO_OVERRIDE) {
+ return -ENODEV;
+ }
+
if (!firmware_has_feature(FW_FEATURE_SPLPAR)) {
printk(KERN_DEBUG "Using default idle\n");
return -ENODEV;
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