linux-kernel - Re: [PATCH] EDAC, ghes: use CPER module handles to locate DIMMs

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Date:   Thu, 30 Aug 2018 12:46:10 -0400
From:   Tyler Baicar <baicar.tyler@...il.com>
To:     James Morse <james.morse@....com>
Cc:     wufan <wufan@...eaurora.org>, mchehab@...nel.org,
        Borislav Petkov <bp@...en8.de>, linux-edac@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] EDAC, ghes: use CPER module handles to locate DIMMs

On Thu, Aug 30, 2018 at 12:32 PM, James Morse <james.morse@....com> wrote:
> Hi Fan,
>
> On 30/08/18 15:40, wufan wrote:
>>>> @@ -327,12 +349,20 @@ void ghes_edac_report_mem_error(int sev,
>>> struct cper_sec_mem_err *mem_err)
>>>>             p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos);
>>>>     if (mem_err->validation_bits &
>>> CPER_MEM_VALID_MODULE_HANDLE) {
>>>>             const char *bank = NULL, *device = NULL;
>>>> +           int index = -1;
>>>> +
>>>>             dmi_memdev_name(mem_err->mem_dev_handle, &bank,
>>> &device);
>>>
>>>> +           p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
>>>> +                        mem_err->mem_dev_handle);
>>>>             if (bank != NULL && device != NULL)
>>>>                     p += sprintf(p, "DIMM location:%s %s ", bank, device);
>>>> -           else
>>>> -                   p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
>>>> -                                mem_err->mem_dev_handle);
>>>
>>> Why do we now print the handle every time? The handle is pretty
>>> meaningless, it can only be used to find the location-strings, if we get those
>>> we print them instead.
>>
>> For ghes_edac the bank/device is informational, and nothing would go wrong
>> if the bank/device numbers are the same as another entry. But the handle
>> is now critical for DIMM lookup, thus pull it out.
>
> Is printing the handle to the kernel log critical?
>

I don't see why we would need this print. The bank/device
print is enough to map what is shown in dmesg to an SMBIOS
entry if that's really needed.

Thanks,
Tyler