[patch V2 10/12] x86/cpu/intel: Evaluate smp_num_siblings early

From: Thomas Gleixner <tglx@linutronix.de>
To: speck@linutronix.de
Subject: [patch V2 10/12] x86/cpu/intel: Evaluate smp_num_siblings early
Date: Wed, 06 Jun 2018 21:27:24 +0200	[thread overview]
Message-ID: <20180606192807.752811736@linutronix.de> (raw)
In-Reply-To: 20180606192714.754943543@linutronix.de

Subject: [patch V2 10/12] x86/cpu/intel: Evaluate smp_num_siblings early
From: Thomas Gleixner <tglx@linutronix.de>

Make use of the new early detection function to initialize smp_num_siblings
on the boot cpu before the MP-Table or ACPI/MADT scan happens. That's
required for force disabling SMT.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/cpu/intel.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -301,6 +301,13 @@ static void early_init_intel(struct cpui
 	}
 
 	check_mpx_erratum(c);
+
+	/*
+	 * Get the number of SMT siblings early from the extended topology
+	 * leaf, if available
+	 */
+	if (detect_extended_topology_early(c) < 0 && IS_ENABLED(CONFIG_X86_32))
+		detect_ht_early(c);
 }
 
 #ifdef CONFIG_X86_32
