From: Borislav Petkov <bp@alien8.de>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>, Borislav Petkov <bp@suse.de>,
Ingo Molnar <mingo@kernel.org>,
"Wysocki, Rafael J" <rafael.j.wysocki@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
"ego@linux.vnet.ibm.com" <ego@linux.vnet.ibm.com>,
Oleg Nesterov <oleg@redhat.com>
Subject: Re: [PATCH] x86, MCE: Kill CPU_POST_DEAD
Date: Mon, 26 May 2014 22:01:22 +0200 [thread overview]
Message-ID: <20140526200122.GC26531@pd.tnic> (raw)
In-Reply-To: <20140522195538.GM4383@pd.tnic>
On Thu, May 22, 2014 at 09:55:38PM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
> Date: Thu, 22 May 2014 16:40:54 +0200
> Subject: [PATCH] x86, MCE: Kill CPU_POST_DEAD
>
> In conjunction with cleaning up CPU hotplug, we want to get rid of
> CPU_POST_DEAD. Kill this instance here and rediscover CMCI banks at the
> end of CPU_DEAD.
>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> ---
> arch/x86/kernel/cpu/mcheck/mce.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index 68317c80de7f..bfde4871848f 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -2391,6 +2391,10 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
> threshold_cpu_callback(action, cpu);
> mce_device_remove(cpu);
> mce_intel_hcpu_update(cpu);
> +
> + /* intentionally ignoring frozen here */
> + if (!(action & CPU_TASKS_FROZEN))
> + cmci_rediscover();
> break;
> case CPU_DOWN_PREPARE:
> smp_call_function_single(cpu, mce_disable_cpu, &action, 1);
> @@ -2402,11 +2406,6 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
> break;
> }
>
> - if (action == CPU_POST_DEAD) {
> - /* intentionally ignoring frozen here */
> - cmci_rediscover();
> - }
> -
> return NOTIFY_OK;
> }
Ok, so I did a little hammering on this one by running a hotplug toggler
script, reading out files under /sys/devices/system/machinecheck... and
suspending to disk and resuming, all at the same time. 'Round 10ish
cycles I did and the box was chugging away happily without any issues.
So, I'm going to queue this one for 3.17, along with the
panic-on-timeout for the default tolerance level one:
http://lkml.kernel.org/r/20140523091041.GA21332@pd.tnic
if you don't have any objections. I'm saying 3.17 because both are
not really critical stuff and could use a full cycle of simmering in
linux-next just fine.
Thanks.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
next prev parent reply other threads:[~2014-05-26 20:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-22 9:23 [PATCH] intel_rapl: Correct hotplug correction Borislav Petkov
2014-05-22 9:43 ` Srivatsa S. Bhat
2014-05-22 10:08 ` Borislav Petkov
2014-05-22 11:54 ` Srivatsa S. Bhat
2014-05-22 12:13 ` Borislav Petkov
2014-05-22 12:32 ` Peter Zijlstra
2014-05-22 15:30 ` [PATCH] x86, MCE: Kill CPU_POST_DEAD Borislav Petkov
2014-05-22 15:50 ` Luck, Tony
2014-05-22 19:55 ` Borislav Petkov
2014-05-22 21:13 ` Srivatsa S. Bhat
2014-05-22 21:31 ` Borislav Petkov
2014-05-22 21:40 ` Srivatsa S. Bhat
2014-05-22 21:43 ` Srivatsa S. Bhat
2014-05-26 20:01 ` Borislav Petkov [this message]
2014-05-22 21:31 ` [PATCH] intel_rapl: Correct hotplug correction Srivatsa S. Bhat
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