linux-kernel - Re: [PATCH V3] tmp patch to fix hotplug issue in CMCI storm

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Date:	Wed, 04 Jul 2012 16:12:41 +0800
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	Chen Gong <gong.chen@...ux.intel.com>
CC:	tglx@...utronix.de, tony.luck@...el.com, borislav.petkov@....com,
	peterz@...radead.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] tmp patch to fix hotplug issue in CMCI storm

于 2012/6/19 14:09, Chen Gong 写道:
> v3->v1
> Thanks very much for Thomas' suggestion to simply the whole logic.
>
> Signed-off-by: Chen Gong <gong.chen@...ux.intel.com>
> ---
>   arch/x86/kernel/cpu/mcheck/mce-internal.h |    2 ++
>   arch/x86/kernel/cpu/mcheck/mce.c          |    1 +
>   arch/x86/kernel/cpu/mcheck/mce_intel.c    |   11 +++++++++++
>   3 files changed, 14 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
> index 2cd73ce..6a05c1d 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce-internal.h
> +++ b/arch/x86/kernel/cpu/mcheck/mce-internal.h
> @@ -31,9 +31,11 @@ extern struct mce_bank *mce_banks;
>   #ifdef CONFIG_X86_MCE_INTEL
>   unsigned long mce_intel_adjust_timer(unsigned long interval);
>   void mce_intel_cmci_poll(void);
> +void mce_intel_hcpu_update(unsigned long cpu);
>   #else
>   # define mce_intel_adjust_timer mce_adjust_timer_default
>   static inline void mce_intel_cmci_poll(void) { }
> +static inline void mce_intel_hcpu_update(unsigned long cpu) { }
>   #endif
>
>   void mce_timer_kick(unsigned long interval);
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index e3f8b94..5e22d99 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -2306,6 +2306,7 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
>   		if (threshold_cpu_callback)
>   			threshold_cpu_callback(action, cpu);
>   		mce_device_remove(cpu);
> +		mce_intel_hcpu_update(cpu);
>   		break;
>   	case CPU_DOWN_PREPARE:
>   		smp_call_function_single(cpu, mce_disable_cpu, &action, 1);
> diff --git a/arch/x86/kernel/cpu/mcheck/mce_intel.c b/arch/x86/kernel/cpu/mcheck/mce_intel.c
> index 92d8b5c..693bc7d 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
> @@ -77,6 +77,14 @@ void mce_intel_cmci_poll(void)
>   	machine_check_poll(MCP_TIMESTAMP, &__get_cpu_var(mce_banks_owned));
>   }
>
> +void mce_intel_hcpu_update(unsigned long cpu)
> +{
> +	if (per_cpu(cmci_storm_state, cpu) == CMCI_STORM_ACTIVE)
> +		atomic_dec(&cmci_storm_on_cpus);
> +
> +	per_cpu(cmci_storm_state, cpu) = CMCI_STORM_NONE;
> +}
> +
>   unsigned long mce_intel_adjust_timer(unsigned long interval)
>   {
>   	if (interval < CMCI_POLL_INTERVAL)
> @@ -119,6 +127,9 @@ static bool cmci_storm_detect(void)
>   	unsigned long ts = __this_cpu_read(cmci_time_stamp);
>   	unsigned long now = jiffies;
>
> +	if (__this_cpu_read(cmci_storm_state) != CMCI_STORM_NONE)
> +		return true;
> +
>   	if (time_before_eq(now, ts + CMCI_STORM_INTERVAL)) {
>   		cnt++;
>   	} else {
>


Hi, Thomas

How is going on for this patch and whole patch series? I don't know
if you have updated it or not.
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