static bool __init intel_idle_verify_cstate()

in intel_idle.c [1526:1540]

• 11 lines of code
• 4 McCabe index (conditional complexity)

static bool __init intel_idle_verify_cstate(unsigned int mwait_hint)
{
	unsigned int mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint) + 1;
	unsigned int num_substates = (mwait_substates >> mwait_cstate * 4) &
					MWAIT_SUBSTATE_MASK;

	/* Ignore the C-state if there are NO sub-states in CPUID for it. */
	if (num_substates == 0)
		return false;

	if (mwait_cstate > 2 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
		mark_tsc_unstable("TSC halts in idle states deeper than C2");

	return true;
}