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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Date:	Fri, 28 Jun 2013 10:31:57 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.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

> +                       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);
> +                       }
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