linux-kernel - Re: [PATCH] sysfs/cpu: Make crash_hotplug attribute world-readable

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Message-ID: <06c0d61f-8dcb-46f6-8710-db1c6163907b@linux.ibm.com>
Date: Fri, 12 Jul 2024 12:01:29 +0530
From: Sourabh Jain <sourabhjain@...ux.ibm.com>
To: Petr Tesařík <petr@...arici.cz>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Eric Biederman <ebiederm@...ssion.com>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Petr Tesarik <ptesarik@...e.com>
Subject: Re: [PATCH] sysfs/cpu: Make crash_hotplug attribute world-readable

Hello Petr,

On 12/07/24 11:51, Petr Tesařík wrote:
> On Fri, 12 Jul 2024 10:00:09 +0530
> Sourabh Jain <sourabhjain@...ux.ibm.com> wrote:
>
>> Hello Petr,
>>
>> Just want to mentioned few points about the commit message. No strong
>> opinion on changing the commit message.
>>
>> On 11/07/24 16:04, Petr Tesarik wrote:
>>> From: Petr Tesarik <ptesarik@...e.com>
>>>
>>> There is no reason to restrict access to this attribute, as it merely
>>> reports whether crash elfcorehdr is automatically updated on CPU hot
>>> plug/unplug and/or online/offline events.
>> Now, it is not just elfcorehdr; there could be multiple kexec segments
>> based on the architecture's needs.
>> For example, on PowerPC, it is elfcorehdr and FDT.
> Right. I am even working with a PowerVM LPAR on an L922 system now. ;-)
>
> OTOH I was just too lazy to invent my own description, so I took it
> from Documentation/ABI/testing/sysfs-devices-system-cpu. That one
> could be improved. And a couple of other places... Expect a patch.
Thanks for point it out, I will send a patch to fix the ABI document for 
crash_hotplug and other places in the kernel. Thanks,
Sourabh Jain