linux-kernel - Re: [PATCH v2 2/2] mce: acpi/apei: Add a boot option to disable ff mode for corrected errors

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Message-ID: <51D19B3F.3060405@linux.vnet.ibm.com>
Date:	Mon, 01 Jul 2013 20:37:43 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Tony Luck <tony.luck@...il.com>
CC:	Borislav Petkov <bp@...en8.de>, ananth@...ibm.com,
	masbock@...ux.vnet.ibm.com, lcm@...ux.vnet.ibm.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Huang Ying <ying.huang@...el.com>
Subject: Re: [PATCH v2 2/2] mce: acpi/apei: Add a boot option to disable ff
 mode for corrected errors

On 06/28/2013 11:01 PM, Tony Luck wrote:
>> +                       if (sec_sev == GHES_SEV_CORRECTED &&
>> +                           (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED) &&
>> +                           (mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS)) {
>> +                               unsigned long pfn;
>> +                               pfn = mem_err->physical_addr >> PAGE_SHIFT;
>
> As Reagan said "Trust ... but verify" ... we should make sure BIOS
> gave us a good pfn
>                                      if (pfn_valid(pfn))
>                                           soft_memory_failure_queue(pfn, 0, 0);
>                                      else
>                                           printk( ...something about
> BIOS giving us bad pfn = %lu\n", pfn);

Ah, nice catch - I thought soft_offline_page() takes care of this, but 
it sure is good to point a finger at the firmware.

Thanks!
- Naveen

>> +                       }
>

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