lkml.org 
[lkml]   [2014]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] x86, MCE: Kill CPU_POST_DEAD
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.
--


\
 
 \ /
  Last update: 2014-05-26 22:21    [W:0.139 / U:0.476 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site