2010-04-15 11:12:35

by Arun R Bharadwaj

[permalink] [raw]
Subject: [v12 PATCH 8/8]: POWER: Enable default_idle when power_save=off.

* Arun R Bharadwaj <[email protected]> [2010-04-15 16:30:46]:

This patch enables default_idle when power_save=off kernel boot
option is specified.

Earlier, this was done by setting ppc_md.power_save = NULL and hence
HMT_low() and HMT_very_low() was called. Now this is defined under
default_idle() and hence by setting boot_option_idle_override = 1,
the cpuidle registration stuff does not happen and hence default_idle
is chosen in cpuidle_idle_call.

Signed-off-by: Arun R Bharadwaj <[email protected]>
---
arch/powerpc/include/asm/processor.h | 2 ++
arch/powerpc/kernel/idle.c | 4 +++-
arch/powerpc/platforms/pseries/processor_idle.c | 5 +++++
3 files changed, 10 insertions(+), 1 deletion(-)

Index: linux.trees.git/arch/powerpc/include/asm/processor.h
===================================================================
--- linux.trees.git.orig/arch/powerpc/include/asm/processor.h
+++ linux.trees.git/arch/powerpc/include/asm/processor.h
@@ -364,6 +364,8 @@ static inline unsigned long get_clean_sp
}
#endif

+extern int boot_option_idle_override;
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PROCESSOR_H */
Index: linux.trees.git/arch/powerpc/kernel/idle.c
===================================================================
--- linux.trees.git.orig/arch/powerpc/kernel/idle.c
+++ linux.trees.git/arch/powerpc/kernel/idle.c
@@ -40,9 +40,11 @@
#define cpu_should_die() 0
#endif

+int boot_option_idle_override;
+
static int __init powersave_off(char *arg)
{
- ppc_md.power_save = NULL;
+ boot_option_idle_override = 1;
return 0;
}
__setup("powersave=off", powersave_off);
Index: linux.trees.git/arch/powerpc/platforms/pseries/processor_idle.c
===================================================================
--- linux.trees.git.orig/arch/powerpc/platforms/pseries/processor_idle.c
+++ linux.trees.git/arch/powerpc/platforms/pseries/processor_idle.c
@@ -167,6 +167,11 @@ static int __init pseries_processor_idle
struct cpuidle_subsystem *pseries_subsys = &cpuidle_subsys;


+ if (boot_option_idle_override) {
+ printk(KERN_DEBUG "Using default idle\n");
+ return 0;
+ }
+
result = cpuidle_register_driver(&pseries_idle_driver);

if (result < 0)