linux-kernel - Re: [PATCH V3: Add Smp support for Allwinner A20. 1/3] Add smp support for Allwinner A20(sunxi 7i).

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Message-ID: <20131002201350.GS12758@n2100.arm.linux.org.uk>
Date:	Wed, 2 Oct 2013 21:13:50 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	cinifr <cinifr@...il.com>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>, coosty@....com,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	"pawel.moll@....co" <pawel.moll@....co>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH V3: Add Smp support for Allwinner A20. 1/3] Add smp
	support for Allwinner A20(sunxi 7i).

On Sat, Sep 28, 2013 at 09:48:11PM +0800, cinifr wrote:
> Hi  Maxime,
>     I have test it, but I found it does not work. If using
> smp_prepare_cpus, the kernenl cannot find the secondary cpus because
> that smp_prepare_cpus semms not be excuted before kernel is booting
> secondary cpus. So I have to use early_initcall.

Please don't do this - you're hacking around what could be a real problem.
Instead, please investigate what is going on and why your smp_prepare_cpus()
function never gets called.

Quite honestly, whenever I see crap like the above, it just makes me want
to tell the ARM-SoC people to forever /dev/null your emails because you
really don't know how to deal with the Linux kernel.

Always *fully* investigate a problem that you find to determine whether
it's your problem or some as yet undiscovered kernel bug.  Never hack
around it and then submit a patch suggesting that your workaround is
something that "has" to be done.
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