select_idle_routine

Name:select_idle_routine

Proto:void select_idle_routine(const struct cpuinfo_x86 *c)

Type:void

Parameter:

Type	Parameter	Name
const struct cpuinfo_x86 *	c

831

If x86_idle || Idle related variables and functions == IDLE_POLL Then Return

834

If boot_cpu_has_bug(CPU is among the affected by Erratum 400 ) Then

835

pr_info("using AMD E400 aware idle routine\n")

836

x86_idle = AMD Erratum 400 aware idle routine. We handle it the same way as C3 power* states (local apic timer and TSC stop).

837

Else if Intel Core2 and older machines prefer MWAIT over HALT for C1.* We can't rely on cpuidle installing MWAIT, because it will not load* on systems that support only C1 -- so the boot default must be MWAIT. Then

838

pr_info("using mwait in idle threads\n")

839

x86_idle = MONITOR/MWAIT with no hints, used for default C1 state. This invokes MWAIT* with interrupts enabled and no flags, which is backwards compatible with the* original MWAIT implementation.

840

Else x86_idle = We use this if we don't have any better idle routine..

**Caller**
Name	Describe
identify_cpu	This does the hard work of actually picking apart the CPU stuff...

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