linux-kernel - Re: [RFC/PATCH] arm: do not skip SMP init calls on SMP_ON

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Date:	Mon, 23 Nov 2015 12:19:20 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
Cc:	kuznetsovg@....rtsoft.ru, Ian Campbell <ian.campbell@...rix.com>,
	Mason <slash.tmp@...e.fr>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Paul Kocialkowski <contact@...lk.fr>,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC/PATCH] arm: do not skip SMP init calls on SMP_ON_UP case

On Mon, Nov 23, 2015 at 12:12:16PM +0000, Russell King - ARM Linux wrote:
> iMX6 is fairly well supported in mainline.  The only reason to use a
> custom kernel is if you want to use some feature which mainline does
> not support (or support very well) such as video decode, the full IPU
> facilities, GPUs or CEC (sorry, I don't have an expansive list.)
> 
> The GPU problem for the GC320/GC880/GC2000 is fairly close to being
> solved in a functional (but maybe not yet performant) manner.

For reference, iMX6S in mainline behaves like this:

Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=12000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
Initializing cgroup subsys net_cls
CPU: Testing write buffer coherency: ok
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
Setting up static identity map for 0x100082c0 - 0x10008318
Brought up 1 CPUs
SMP: Total of 1 processors activated (6.00 BogoMIPS).
CPU: All CPU(s) started in SVC mode.

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