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

[Florian Fainelli]

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@xxxxxxx>
> >
> > 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@xxxxxxxxxxxxx>
> > Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
> > Signed-off-by: Pierre Gondois <pierre.gondois@xxxxxxx>
> > Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> > Link: https://lore.kernel.org/r/20230414081453.244787-4-pierre.gondois@xxxxxxx
> > Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> > Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
>
> 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.
--
Florian

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