static void __init sklh_idle_state_table_update()

in intel_idle.c [1459:1494]

• 21 lines of code
• 6 McCabe index (conditional complexity)

static void __init sklh_idle_state_table_update(void)
{
	unsigned long long msr;
	unsigned int eax, ebx, ecx, edx;


	/* if PC10 disabled via cmdline intel_idle.max_cstate=7 or shallower */
	if (max_cstate <= 7)
		return;

	/* if PC10 not present in CPUID.MWAIT.EDX */
	if ((mwait_substates & (0xF << 28)) == 0)
		return;

	rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr);

	/* PC10 is not enabled in PKG C-state limit */
	if ((msr & 0xF) != 8)
		return;

	ecx = 0;
	cpuid(7, &eax, &ebx, &ecx, &edx);

	/* if SGX is present */
	if (ebx & (1 << 2)) {

		rdmsrl(MSR_IA32_FEAT_CTL, msr);

		/* if SGX is enabled */
		if (msr & (1 << 18))
			return;
	}

	skl_cstates[5].flags |= CPUIDLE_FLAG_UNUSABLE;	/* C8-SKL */
	skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE;	/* C9-SKL */
}