linux-kernel - Re: [PATCH] platform/x86/intel/pmt: Ignore uninitialized entries

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Message-ID: <ad2b3eed-ac33-c13a-5c43-27da89496d86@redhat.com>
Date:   Mon, 17 Apr 2023 12:13:09 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        "David E. Box" <david.e.box@...ux.intel.com>
Cc:     markgross@...nel.org, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86/intel/pmt: Ignore uninitialized entries

Hi,

On 4/13/23 12:13, Ilpo Järvinen wrote:
> On Wed, 12 Apr 2023, David E. Box wrote:
> 
>> On Intel Xeon, unused PMT regions will have uninitialized discovery headers
>> containing all 0xF. Instead of returning an error, just skip the region.
>>
>> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
>> ---
>>  drivers/platform/x86/intel/pmt/telemetry.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
>> index 71cdef42084a..39cbc87cc28a 100644
>> --- a/drivers/platform/x86/intel/pmt/telemetry.c
>> +++ b/drivers/platform/x86/intel/pmt/telemetry.c
>> @@ -78,7 +78,7 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
>>  	 * reserved for future use. They have zero size. Do not fail
>>  	 * probe for these. Just ignore them.
>>  	 */
>> -	if (header->size == 0)
>> +	if (header->size == 0 || header->access_type == 0xF)
>>  		return 1;
>>  
>>  	return 0;
> 
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Thank you both for the patch + review, I've applied this patch
to my review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans