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

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Message-ID: <20230530-basically-wildly-84415a94171d@spud>
Date:   Tue, 30 May 2023 22:39:00 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Florian Fainelli <florian.fainelli@...adcom.com>
Cc:     stable@...r.kernel.org, Pierre Gondois <pierre.gondois@....com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Sudeep Holla <sudeep.holla@....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

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?

Cheers,
Conor.