Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760532Ab2FDMlg (ORCPT ); Mon, 4 Jun 2012 08:41:36 -0400 Received: from s15943758.onlinehome-server.info ([217.160.130.188]:59036 "EHLO mail.x86-64.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760524Ab2FDMld (ORCPT ); Mon, 4 Jun 2012 08:41:33 -0400 From: Borislav Petkov To: Ingo Molnar Cc: X86-ML , LKML , Borislav Petkov , Peter Zijlstra , Andreas Herrmann Subject: [PATCH] x86, smp: Fix topology checks on AMD MCM Date: Mon, 4 Jun 2012 14:41:57 +0200 Message-Id: <1338813717-28112-1-git-send-email-bp@amd64.org> X-Mailer: git-send-email 1.7.9.3.362.g71319 In-Reply-To: <20120529174804.GC8263@alberich.amd.com> References: <20120529174804.GC8263@alberich.amd.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2837 Lines: 64 From: Borislav Petkov The warning below triggers on AMD MCM packages because physical package IDs on the cores of a _physical_ socket are the same. I.e., this field says which CPUs belong to the same physical package. However, the same two CPUs belong to two different internal, i.e. "logical" nodes in the same physical socket which is reflected in the CPU-to-node map on x86 with NUMA. Which makes this check wrong on the above topologies so circumvent it. [ 0.444413] Booting Node 0, Processors #1 #2 #3 #4 #5 Ok. [ 0.461388] ------------[ cut here ]------------ [ 0.465997] WARNING: at arch/x86/kernel/smpboot.c:310 topology_sane.clone.1+0x6e/0x81() [ 0.473960] Hardware name: Dinar [ 0.477170] sched: CPU #6's mc-sibling CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency. [ 0.486860] Booting Node 1, Processors #6 [ 0.491104] Modules linked in: [ 0.494141] Pid: 0, comm: swapper/6 Not tainted 3.4.0+ #1 [ 0.499510] Call Trace: [ 0.501946] [] ? topology_sane.clone.1+0x6e/0x81 [ 0.508185] [] warn_slowpath_common+0x85/0x9d [ 0.514163] [] warn_slowpath_fmt+0x46/0x48 [ 0.519881] [] topology_sane.clone.1+0x6e/0x81 [ 0.525943] [] set_cpu_sibling_map+0x251/0x371 [ 0.532004] [] start_secondary+0x19a/0x218 [ 0.537729] ---[ end trace 4eaa2a86a8e2da22 ]--- [ 0.628197] #7 #8 #9 #10 #11 Ok. [ 0.807108] Booting Node 3, Processors #12 #13 #14 #15 #16 #17 Ok. [ 0.897587] Booting Node 2, Processors #18 #19 #20 #21 #22 #23 Ok. [ 0.917443] Brought up 24 CPUs Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Andreas Herrmann Link: http://lkml.kernel.org/r/20120529135442.GE29157@aftab.osrc.amd.com Signed-off-by: Borislav Petkov --- arch/x86/kernel/smpboot.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index f56f96da77f5..912e5cac61d8 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -350,7 +350,8 @@ static bool __cpuinit match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) static bool __cpuinit match_mc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o) { if (c->phys_proc_id == o->phys_proc_id) - return topology_sane(c, o, "mc"); + if (!cpu_has(c, X86_FEATURE_AMD_DCM)) + return topology_sane(c, o, "mc"); return false; } -- 1.7.9.3.362.g71319 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/