linux-kernel - Re: [PATCH] thermal: use cpumask_var

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Date:   Fri, 3 Feb 2017 09:16:18 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: use cpumask_var_t for on-stack cpu masks

On 02-02-17, 15:46, Arnd Bergmann wrote:
> Putting a bare cpumask structure on the stack produces a warning on
> large SMP configurations:
> 
> drivers/thermal/cpu_cooling.c: In function 'cpufreq_state2power':
> drivers/thermal/cpu_cooling.c:644:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> drivers/thermal/cpu_cooling.c: In function '__cpufreq_cooling_register':
> drivers/thermal/cpu_cooling.c:898:1: warning: the frame size of 1104 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> The recommended workaround is to use cpumask_var_t, which behaves just like
> a normal cpu mask in most cases, but turns into a dynamic allocation
> when CONFIG_CPUMASK_OFFSTACK is set.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/thermal/cpu_cooling.c | 39 ++++++++++++++++++++++++++-------------
>  1 file changed, 26 insertions(+), 13 deletions(-)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh