87 lines
2.9 KiB
Diff
87 lines
2.9 KiB
Diff
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From 680ac028240f8747f31c03986fbcf18b2b521e93 Mon Sep 17 00:00:00 2001
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From: Borislav Petkov <bp@suse.de>
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Date: Mon, 27 Jul 2015 09:58:05 +0200
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Subject: [PATCH] x86/cpu/cacheinfo: Fix teardown path
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Philip Müller reported a hang when booting 32-bit 4.1 kernel on
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an AMD box. A fragment of the splat was enough to pinpoint the
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issue:
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task: f58e0000 ti: f58e8000 task.ti: f58e800
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EIP: 0060:[<c135a903>] EFLAGS: 00010206 CPU: 0
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EIP is at free_cache_attributes+0x83/0xd0
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EAX: 00000001 EBX: f589d46c ECX: 00000090 EDX: 360c2000
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ESI: 00000000 EDI: c1724a80 EBP: f58e9ec0 ESP: f58e9ea0
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DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
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CR0: 8005003b CR2: 000000ac CR3: 01731000 CR4: 000006d0
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cache_shared_cpu_map_setup() did check sibling CPUs cacheinfo
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descriptor while the respective teardown path
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cache_shared_cpu_map_remove() didn't. Fix that.
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From tglx's version: to be on the safe side, move the cacheinfo
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descriptor check to free_cache_attributes(), thus cleaning up
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the hotplug path a little and making this even more robust.
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Reported-by: Philip Müller <philm@manjaro.org>
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Signed-off-by: Borislav Petkov <bp@suse.de>
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Cc: <stable@vger.kernel.org> # v4.1+
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Cc: Andre Przywara <andre.przywara@arm.com>
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Cc: Guenter Roeck <linux@roeck-us.net>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Sudeep Holla <sudeep.holla@arm.com>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: linux-kernel@vger.kernel.org
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Cc: manjaro-dev@manjaro.org
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Link: http://lkml.kernel.org/r/20150727075805.GA20416@nazgul.tnic
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Link: https://lkml.kernel.org/r/55B47BB8.6080202@manjaro.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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---
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drivers/base/cacheinfo.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
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index 764280a91776..e9fd32e91668 100644
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--- a/drivers/base/cacheinfo.c
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+++ b/drivers/base/cacheinfo.c
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@@ -148,7 +148,11 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
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if (sibling == cpu) /* skip itself */
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continue;
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+
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sib_cpu_ci = get_cpu_cacheinfo(sibling);
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+ if (!sib_cpu_ci->info_list)
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+ continue;
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+
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sib_leaf = sib_cpu_ci->info_list + index;
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cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
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cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
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@@ -159,6 +163,9 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
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static void free_cache_attributes(unsigned int cpu)
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{
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+ if (!per_cpu_cacheinfo(cpu))
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+ return;
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+
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cache_shared_cpu_map_remove(cpu);
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kfree(per_cpu_cacheinfo(cpu));
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@@ -514,8 +521,7 @@ static int cacheinfo_cpu_callback(struct notifier_block *nfb,
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break;
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case CPU_DEAD:
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cache_remove_dev(cpu);
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- if (per_cpu_cacheinfo(cpu))
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- free_cache_attributes(cpu);
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+ free_cache_attributes(cpu);
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break;
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}
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return notifier_from_errno(rc);
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--
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2.4.3
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