linux-kernel - Re: [PATCH stable 6.3 v2] arch_topology: Remove early cacheinfo error message if -ENOENT

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Date:   Wed, 31 May 2023 08:28:26 -0700
From:   Florian Fainelli <florian.fainelli@...adcom.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Conor Dooley <conor@...nel.org>, stable@...r.kernel.org,
        Pierre Gondois <pierre.gondois@....com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "open list:GENERIC ARCHITECTURE TOPOLOGY" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH stable 6.3 v2] arch_topology: Remove early cacheinfo error
 message if -ENOENT



On 5/31/2023 1:53 AM, Sudeep Holla wrote:
> On Tue, May 30, 2023 at 03:42:45PM -0700, Florian Fainelli wrote:
>> Hi Conor,
>>
>> On 5/30/23 14:39, Conor Dooley wrote:
>>> Yo Florian,
>>>
>>> On Tue, May 30, 2023 at 01:19:55PM -0700, Florian Fainelli wrote:
>>>> From: Pierre Gondois <pierre.gondois@....com>
>>>>
>>>> commit 3522340199cc060b70f0094e3039bdb43c3f6ee1 upstream
>>>>
>>>> fetch_cache_info() tries to get the number of cache leaves/levels
>>>> for each CPU in order to pre-allocate memory for cacheinfo struct.
>>>> Allocating this memory later triggers a:
>>>>     'BUG: sleeping function called from invalid context'
>>>> in PREEMPT_RT kernels.
>>>>
>>>> If there is no cache related information available in DT or ACPI,
>>>> fetch_cache_info() fails and an error message is printed:
>>>>     'Early cacheinfo failed, ret = ...'
>>>>
>>>> Not having cache information should be a valid configuration.
>>>> Remove the error message if fetch_cache_info() fails with -ENOENT.
>>>>
>>>> Suggested-by: Conor Dooley <conor.dooley@...rochip.com>
>>>> Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
>>>> Signed-off-by: Pierre Gondois <pierre.gondois@....com>
>>>> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>>>> Link: https://lore.kernel.org/r/20230414081453.244787-4-pierre.gondois@arm.com
>>>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>>>> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
>>>
>>> How come this now needs a backport? Did the rest of the series get
>>> backported, but not this one since it has no fixes tag?
>>
>> Humm, indeed, this has been present in v6.3.2 since I requested it to be
>> included. The error that I saw this morning was not -ENOENT, but -EINVAL.
>>
>> With those patches applied, no more -EINVAL:
>>
>> cacheinfo: Allow early level detection when DT/ACPI info is missing/broken
>> cacheinfo: Add arm64 early level initializer implementation
>> cacheinfo: Add arch specific early level initializer
>> cacheinfo: Add use_arch[|_cache]_info field/function
>>
>> I will submit those shortly unless we think they better not be in 6.3, in
>> which case it would be nice to silence those -EINVAL errors.
> 
> I prefer this option instead of back porting all the above 4 as there are
> some pending fixes for the issues found in those patches. I am fine if Greg
> is happy with the backport, so no strong rejection from my side :).

OK, so are you suggesting that we specific check for -EINVAL and -ENOENT 
rather than take all of the 4 above patches, if so, any preference on 
how to do it given the state of 6.3 stable?
-- 
Florian

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