From mboxrd@z Thu Jan 1 00:00:00 1970 From: Prarit Bhargava Subject: [PATCH] arch/x86: Initialize __max_smt_threads to 1 Date: Wed, 6 Dec 2017 07:56:08 -0500 Message-ID: <20171206125608.4750-1-prarit@redhat.com> Cc: Prarit Bhargava , Jakub Kicinski , netdev@vger.kernel.org, Clark Williams , Andi Kleen , x86@kernel.org, Thomas Gleixner To: linux-kernel@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:60472 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750989AbdLFM4N (ORCPT ); Wed, 6 Dec 2017 07:56:13 -0500 Sender: netdev-owner@vger.kernel.org List-ID: A single socket, single core, single thread system has __max_smt_threads set to 0 since smp_callin() is not called. __max_smt_threads must be a minimum of 1. Fixes: b1cbacc8663a ("x86/smpboot: Do not use smp_num_siblings in __max_logical_packages calculation) Signed-off-by: Prarit Bhargava Cc: Jakub Kicinski Cc: netdev@vger.kernel.org Cc: "netdev@vger.kernel.org" Cc: Clark Williams Cc: Andi Kleen Cc: x86@kernel.org Cc: Thomas Gleixner Link: https://marc.info/?t=151246092100004&r=1&w=2 --- arch/x86/kernel/smpboot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index eaee15fb7d8b..882c61e1d7a2 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -106,7 +106,7 @@ EXPORT_SYMBOL(__max_logical_packages); static unsigned int logical_packages __read_mostly; /* Maximum number of SMT threads on any online core */ -int __max_smt_threads __read_mostly; +int __read_mostly __max_smt_threads = 1; /* Flag to indicate if a complete sched domain rebuild is required */ bool x86_topology_update; -- 2.15.0.rc0.39.g2f0e14e64