linux-kernel - [PATCH v3] x86, hotplug: fix llc shared map unreleased during cpu hotplug

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Message-Id: <1406624353-4782-1-git-send-email-wanpeng.li@linux.intel.com>
Date:	Tue, 29 Jul 2014 16:59:13 +0800
From:	Wanpeng Li <wanpeng.li@...ux.intel.com>
To:	<hpa@...or.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
	Borislav Petkov <bp@...en8.de>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Toshi Kani <toshi.kani@...com>, linux-kernel@...r.kernel.org,
	Zhang Yang <yang.z.zhang@...el.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
Subject: [PATCH v3] x86, hotplug: fix llc shared map unreleased during cpu hotplug

[  220.262245] Call Trace:
[  220.262252]  [<ffffffff810e8396>] load_balance+0x156/0x980
[  220.262259]  [<ffffffff816eeffe>] ? _raw_spin_unlock_irqrestore+0x2e/0xa0
[  220.262266]  [<ffffffff810e9aa3>] idle_balance+0xe3/0x150
[  220.262270]  [<ffffffff816ec4e7>] __schedule+0x797/0x8d0
[  220.262277]  [<ffffffff816ec934>] schedule+0x24/0x70
[  220.262283]  [<ffffffff816e9cd9>] schedule_timeout+0x119/0x1f0
[  220.262294]  [<ffffffff810bb6e0>] ? lock_timer_base+0x70/0x70
[  220.262301]  [<ffffffff816e9dc9>] schedule_timeout_uninterruptible+0x19/0x20
[  220.262308]  [<ffffffff810bd3e8>] msleep+0x18/0x20
[  220.262317]  [<ffffffff813aa11a>] lock_device_hotplug_sysfs+0x2a/0x50
[  220.262323]  [<ffffffff813aa16e>] online_store+0x2e/0x80
[  220.262358]  [<ffffffff813a873b>] dev_attr_store+0x1b/0x20

Last level cache shared map is built during cpu up and build sched domain 
routine takes advantage of it to setup sched domain cpu topology, however, 
llc shared map is unreleased during cpu disable which lead to invalid sched 
domain cpu topology. This patch fix it by release llc shared map correctly
during cpu disable.

Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
---
v1 -> v2:
 * fix subject line
v2 -> v3:
 * simplify backtrace 

 arch/x86/kernel/smpboot.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 5492798..0134ec7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1292,6 +1292,9 @@ static void remove_siblinginfo(int cpu)
 
 	for_each_cpu(sibling, cpu_sibling_mask(cpu))
 		cpumask_clear_cpu(cpu, cpu_sibling_mask(sibling));
+	for_each_cpu(sibling, cpu_llc_shared_mask(cpu))
+		cpumask_clear_cpu(cpu, cpu_llc_shared_mask(sibling));
+	cpumask_clear(cpu_llc_shared_mask(cpu));
 	cpumask_clear(cpu_sibling_mask(cpu));
 	cpumask_clear(cpu_core_mask(cpu));
 	c->phys_proc_id = 0;
-- 
1.9.1

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