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authorThomas Renninger <trenn@suse.de>2010-11-03 17:06:14 +0100
committerLen Brown <len.brown@intel.com>2011-01-12 12:47:30 -0500
commitd18960494f65ca4fa0d67c865aaca99452070d15 (patch)
tree93c37d0dd4bf8c254b312f75eb97f54077a9baed /arch/ia64
parentd8c216cfa57e8a579f41729cbb88c97835d9ac8d (diff)
downloadlinux-2.6.38-lt-ux500-d18960494f65ca4fa0d67c865aaca99452070d15.tar.gz
ACPI, intel_idle: Cleanup idle= internal variables
Having four variables for the same thing: idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides is rather confusing and unnecessary complex. if idle= boot param is passed, only set up one variable: boot_option_idle_overrides Introduces following functional changes/fixes: - intel_idle driver does not register if any idle=xy boot param is passed. - processor_idle.c will also not register a cpuidle driver and get active if idle=halt is passed. Before a cpuidle driver with one (C1, halt) state got registered Now the default_idle function will be used which finally uses the same idle call to enter sleep state (safe_halt()), but without registering a whole cpuidle driver. That means idle= param will always avoid cpuidle drivers to register with one exception (same behavior as before): idle=nomwait may still register acpi_idle cpuidle driver, but C1 will not use mwait, but hlt. This can be a workaround for IO based deeper sleep states where C1 mwait causes problems. Signed-off-by: Thomas Renninger <trenn@suse.de> cc: x86@kernel.org Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/include/asm/processor.h5
-rw-r--r--arch/ia64/kernel/process.c6
2 files changed, 4 insertions, 7 deletions
diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 348e44d08ce..03afe797074 100644
--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -717,8 +717,9 @@ prefetchw (const void *x)
#define spin_lock_prefetch(x) prefetchw(x)
extern unsigned long boot_option_idle_override;
-extern unsigned long idle_halt;
-extern unsigned long idle_nomwait;
+
+enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
+ IDLE_NOMWAIT, IDLE_POLL};
#endif /* !__ASSEMBLY__ */
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 16f1c7b04c6..6d33c5cc94f 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -53,12 +53,8 @@
void (*ia64_mark_idle)(int);
-unsigned long boot_option_idle_override = 0;
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(boot_option_idle_override);
-unsigned long idle_halt;
-EXPORT_SYMBOL(idle_halt);
-unsigned long idle_nomwait;
-EXPORT_SYMBOL(idle_nomwait);
void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);