netdev - Re: [PATCH 2/5] net: mvpp2: use {get,put}_cpu() instead of smp_processor

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Date:   Thu, 8 Jun 2017 17:01:36 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Marcin Wojtas <mw@...ihalf.com>,
        Stefan Chulski <stefanc@...vell.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Hanna Hawa <hannah@...vell.com>,
        Yehuda Yitschak <yehuday@...vell.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Markus Elfring <elfring@...rs.sourceforge.net>
Subject: Re: [PATCH 2/5] net: mvpp2: use {get,put}_cpu() instead of
 smp_processor_id()

On 08/06/17 16:27, Thomas Petazzoni wrote:
> smp_processor_id() should not be used in migration-enabled contexts. We
> originally thought it was OK in the specific situation of this driver,
> but it was wrong, and calling smp_processor_id() in a migration-enabled
> context prints a big fat warning when CONFIG_DEBUG_PREEMPT=y.
> 
> Therefore, this commit replaces the smp_processor_id() in
> migration-enabled contexts by the appropriate get_cpu/put_cpu sections.
> 
> Reported-by: Marc Zyngier <marc.zyngier@....com>
> Fixes: a786841df72e ("net: mvpp2: handle register mapping and access for PPv2.2")
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

Tested-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...