From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
rt@linutronix.de, Tony Luck <tony.luck@intel.com>,
linux-edac@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH 5/7] x86/mcheck: reorganize the hotplug callbacks
Date: Fri, 11 Nov 2016 20:36:31 +0100 [thread overview]
Message-ID: <20161111193631.srv7sxqzykvymgbf@linutronix.de> (raw)
In-Reply-To: <20161111184453.ax5getrj5y3i4fuc@pd.tnic>
On 2016-11-11 19:44:53 [+0100], Borislav Petkov wrote:
> > ---
> > arch/x86/kernel/cpu/mcheck/mce.c | 31 +++++++++++++++----------------
> > 1 file changed, 15 insertions(+), 16 deletions(-)
> >
> > diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> > index 052b5e05c3c4..3da6fd94fa2e 100644
> > --- a/arch/x86/kernel/cpu/mcheck/mce.c
> > +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> > @@ -1771,6 +1771,9 @@ void (*machine_check_vector)(struct pt_regs *, long error_code) =
> > */
> > void mcheck_cpu_init(struct cpuinfo_x86 *c)
> > {
> > + struct timer_list *t = this_cpu_ptr(&mce_timer);
> > + unsigned int cpu = smp_processor_id();
> > +
> > if (mca_cfg.disabled)
> > return;
> >
> > @@ -1796,7 +1799,7 @@ void mcheck_cpu_init(struct cpuinfo_x86 *c)
> > __mcheck_cpu_init_generic();
> > __mcheck_cpu_init_vendor(c);
> > __mcheck_cpu_init_clear_banks();
> > - __mcheck_cpu_init_timer();
> > + setup_pinned_timer(t, mce_timer_fn, cpu);
>
> Why not leave all that setup stuff in __mcheck_cpu_init_timer() ?
>
__mcheck_cpu_init_timer() does not only prepare the timer but also fires
it. And __mcheck_cpu_init_timer() is invoked from other places and the
caller probably expects the timer to be fired.
> > @@ -2517,11 +2518,10 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
> > mce_device_remove(cpu);
> > return NOTIFY_BAD;
> > }
> > -
> > + mce_reenable_cpu();
> > + mce_start_timer(cpu, t);
> > break;
> > case CPU_DEAD:
> > - mce_threshold_remove_device(cpu);
> > - mce_device_remove(cpu);
> > mce_intel_hcpu_update(cpu);
> >
> > /* intentionally ignoring frozen here */
>
> There's another place for cpuhp_tasks_frozen replacement here:
>
> /* intentionally ignoring frozen here */
> if (!(action & CPU_TASKS_FROZEN))
> cmci_rediscover();
>
> into
>
> if (!cpuhp_tasks_frozen)
> cmci_rediscover();
Correct. This is done later since it still works. For functions like
mce_disable_cpu() which were converted here I replaced the check so I
keep them void and don't care about the argument.
Sebastian
next prev parent reply other threads:[~2016-11-11 19:36 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-03 14:49 cpu hotplug: convert more drivers (batch #4) Sebastian Andrzej Siewior
2016-11-03 14:49 ` [PATCH 01/25] fs/buffer: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-09 22:52 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 16:24 ` [PATCH 01/25] " Al Viro
2016-11-10 16:31 ` Thomas Gleixner
2016-11-03 14:49 ` [PATCH 02/25] kernel/printk: " Sebastian Andrzej Siewior
2016-11-09 22:52 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:49 ` [PATCH 03/25] mm/memcg: " Sebastian Andrzej Siewior
2016-11-09 22:53 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 04/25] lib/percpu_counter: " Sebastian Andrzej Siewior
2016-11-09 22:53 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 05/25] lib/radix-tree: " Sebastian Andrzej Siewior
2016-11-09 22:54 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 06/25] mm/page_alloc: " Sebastian Andrzej Siewior
2016-11-09 22:54 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 07/25] mm/vmscan: " Sebastian Andrzej Siewior
2016-11-09 22:55 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 08/25] net/dev: " Sebastian Andrzej Siewior
2016-11-09 22:55 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 09/25] net/flowcache: " Sebastian Andrzej Siewior
2016-11-09 22:56 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 10/25] s390/smp: Make cpu notifier symetric Sebastian Andrzej Siewior
2016-11-04 14:22 ` Heiko Carstens
2016-11-04 14:41 ` [PATCH 10/25 v2] " Sebastian Andrzej Siewior
2016-11-09 22:56 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-11-03 14:50 ` [PATCH 11/25] s390/smp: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-04 14:34 ` Heiko Carstens
2016-11-04 14:45 ` [PATCH 11/25 v2] " Sebastian Andrzej Siewior
2016-11-09 22:57 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 12/25] drivers base/cacheinfo: " Sebastian Andrzej Siewior
2016-11-09 22:57 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 13/25] drivers base/topology: " Sebastian Andrzej Siewior
2016-11-09 22:57 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 14/25] ia64/err-inject: " Sebastian Andrzej Siewior
2016-11-09 22:58 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 15/25] ia64/palinfo: " Sebastian Andrzej Siewior
2016-11-09 22:58 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 16/25] ia64/salinfo: " Sebastian Andrzej Siewior
2016-11-03 15:45 ` kbuild test robot
2016-11-03 17:31 ` [PATCH 16/25 v2] " Sebastian Andrzej Siewior
2016-11-09 22:59 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 16:22 ` [PATCH 16/25] " kbuild test robot
2016-11-03 14:50 ` [PATCH 17/25] ia64/topology: " Sebastian Andrzej Siewior
2016-11-03 15:53 ` kbuild test robot
2016-11-03 17:33 ` [PATCH 17/25 v2] " Sebastian Andrzej Siewior
2016-11-09 22:59 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 18/25] x86/mcheck: Move threshold_create_device() Sebastian Andrzej Siewior
2016-11-07 10:32 ` Borislav Petkov
2016-11-03 14:50 ` [PATCH 19/25] x86/mcheck: Explicit cleanup on failure in mce_amd Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 20/25] x86/mcheck: Be prepared for a rollback back to the ONLINE state Sebastian Andrzej Siewior
2016-11-07 10:32 ` Borislav Petkov
2016-11-07 10:40 ` Sebastian Andrzej Siewior
2016-11-07 12:31 ` Borislav Petkov
2016-11-07 17:23 ` Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 21/25] x86/mcheck: Split threshold_cpu_callback into two callbacks Sebastian Andrzej Siewior
2016-11-07 13:20 ` Borislav Petkov
2016-11-07 13:25 ` Sebastian Andrzej Siewior
2016-11-07 15:07 ` Borislav Petkov
2016-11-07 15:14 ` Sebastian Andrzej Siewior
2016-11-07 17:26 ` Sebastian Andrzej Siewior
2016-11-07 18:19 ` Borislav Petkov
2016-11-03 14:50 ` [PATCH 22/25] x86/mcheck: Do the init in one place Sebastian Andrzej Siewior
2016-11-07 18:45 ` Borislav Petkov
2016-11-07 18:55 ` Luck, Tony
2016-11-07 20:12 ` Borislav Petkov
2016-11-08 9:23 ` Borislav Petkov
2016-11-09 14:22 ` Sebastian Andrzej Siewior
2016-11-09 15:38 ` Borislav Petkov
2016-11-09 16:24 ` Sebastian Andrzej Siewior
2016-11-09 17:01 ` Borislav Petkov
2016-11-09 17:22 ` Sebastian Andrzej Siewior
2016-11-09 18:37 ` Luck, Tony
2016-11-10 9:00 ` Sebastian Andrzej Siewior
2016-11-10 9:18 ` Borislav Petkov
2016-11-10 17:44 ` x86/mcheck: convert to hotplug state engine, take #2 Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 1/7] x86/mcheck: Move threshold_create_device() Sebastian Andrzej Siewior
2016-11-16 8:39 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 2/7] x86/mcheck: Explicit cleanup on failure in mce_amd Sebastian Andrzej Siewior
2016-11-16 8:40 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 3/7] x86/mcheck: Be prepared for a rollback back to the ONLINE state Sebastian Andrzej Siewior
2016-11-16 8:40 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 4/7] x86/mcheck: Split threshold_cpu_callback into two callbacks Sebastian Andrzej Siewior
2016-11-16 8:41 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 5/7] x86/mcheck: reorganize the hotplug callbacks Sebastian Andrzej Siewior
2016-11-11 18:44 ` Borislav Petkov
2016-11-11 19:36 ` Sebastian Andrzej Siewior [this message]
2016-11-11 19:57 ` Borislav Petkov
2016-11-14 10:47 ` [PATCH 5/7 v2] " Sebastian Andrzej Siewior
2016-11-16 8:41 ` [tip:smp/hotplug] x86/mcheck: Reorganize " tip-bot for Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 6/7] x86/mcheck: Move CPU_ONLINE and CPU_DOWN_PREPARE to hotplug state machine Sebastian Andrzej Siewior
2016-11-16 8:42 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 17:44 ` [PATCH 7/7] x86/mcheck: Move CPU_DEAD " Sebastian Andrzej Siewior
2016-11-11 20:18 ` Borislav Petkov
2016-11-16 8:42 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-10 10:22 ` [PATCH 22/25] x86/mcheck: Do the init in one place Thomas Gleixner
2016-11-10 10:27 ` Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 23/25] x86/mcheck: Make CPU_DOWN_PREPARE the counter part of CPU_STARTING Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 24/25] x86/mcheck: Move CPU_ONLINE to hotplug state machine Sebastian Andrzej Siewior
2016-11-03 14:50 ` [PATCH 25/25] x86/mcheck: Move CPU_DEAD " Sebastian Andrzej Siewior
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