linux-kernel - Re: [PATCH v2 6/6] of: of_cpu_phandle_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <78797f80-bdd6-49ef-b1cf-ffe4dc1dc5f6@kernel.org>
Date: Tue, 6 May 2025 12:56:43 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Alireza Sanaee <alireza.sanaee@...wei.com>
Cc: devicetree@...r.kernel.org, robh@...nel.org, jonathan.cameron@...wei.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linuxarm@...wei.com, mark.rutland@....com,
 shameerali.kolothum.thodi@...wei.com
Subject: Re: [PATCH v2 6/6] of: of_cpu_phandle_to_id to support SMT threads

On 06/05/2025 12:23, Alireza Sanaee wrote:
> On Sun, 4 May 2025 19:52:34 +0200
> Krzysztof Kozlowski <krzk@...nel.org> wrote:
> 
>> On 04/05/2025 19:51, Krzysztof Kozlowski wrote:
>>>> In the CPU map, there are two cases that only one occurs at at
>>>> time. 1) "cpu" = <phandle>
>>>>     2) "cpus" = <phandle> <index>
>>>>
>>>> The first case addresses non-SMTs and the second case addresses
>>>> SMTs that the variable must be cpu(s) with an index where we later
>>>> look up the reg array with that.
>>>>
>>>>     core0 {
>>>>       thread0 {
>>>>         cpus = <&cpu0 0>;  
>>>
>>> Not so sure, dtschema says only one item is allowed in the phandle
>>> and I do not see here binding change.
>>>
>>> Although this wasn't even sent to me, so I'll just ignore your
>>> patchset.  
>>
>> Ah, there was no binding in the patchset, so that's why I did not get
>> it. Makes sense now, but question about missing binding change stays.
>>
>> Best regards,
>> Krzysztof
>>
> 
> Hi Krzysztof,
> 
> There are some existing bindings in which this pattern has been
> used, so I don't think I am changing binding really.
> 
> https://www.kernel.org/doc/Documentation/devicetree/bindings/thermal/thermal-zones.yaml#:~:text=cooling%2Ddevice%20%3D%20%3C%26CPU0%203%203%3E%2C%20%3C%26CPU1%203%203%3E%2C
I do not understand this - it is not cpus phandle. Please respond to
specific comment: how many arguments are allowed by dtschema for cpus?

Best regards,
Krzysztof