linux-kernel - Re: [PATCH] ARM: owl: smp: Drop owl_secondary

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Date:   Fri, 07 Jul 2017 09:34:18 +0200
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Andreas Färber <afaerber@...e.de>,
        linux-arm-kernel@...ts.infradead.org, support@...aker.org,
        张天益 <tyzhang@...ions-semi.com>,
        Arnd Bergmann <arnd@...db.de>,
        梅利 <harrymei@...ions-semi.com>,
        linux-kernel@...r.kernel.org,
        Thomas Liau <thomas.liau@...ions-semi.com>,
        Russell King <linux@...linux.org.uk>, support@...ietech.com,
        lee@...ietech.com,
        张东风 <zhangdf@...ions-semi.com>,
        刘炜 <liuwei@...ions-semi.com>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Subject: Re: [PATCH] ARM: owl: smp: Drop owl_secondary_boot()

Hi Florian,
 
 On jeu., juil. 06 2017, Florian Fainelli <f.fainelli@...il.com> wrote:

> On 07/06/2017 10:38 AM, Alexandre Belloni wrote:
>> On 06/07/2017 at 19:17:28 +0200, Andreas Färber wrote:
>>> Am 05.07.2017 um 04:36 schrieb Florian Fainelli:
>>>> On July 4, 2017 4:32:18 PM PDT, "Andreas Färber" <afaerber@...e.de> wrote:
>>>>> Commit 18cfd9429d8a82c49add8f3ca9d366599bfcac45 ("ARM: owl: smp: Drop
>>>>> bogus holding pen") simplified the S500 SMP code by removing a loop for
>>>>> pen_release in owl_secondary_boot(). Since then it is only calling
>>>>> owl_v7_invalidate_l1() before branching to secondary_startup().
>>>>>
>>>>> The owl_v7_invalidate_l1() assembler function is superfluous, too.
>>>>> Therefore drop owl_secondary_boot() and use secondary_boot() directly.
>>>>>
>>>>> Cc: David Liu <liuwei@...ions-semi.com>
>>>>> Signed-off-by: Andreas Färber <afaerber@...e.de>
>>>>> ---
>>>>
>>>>> -	writel(virt_to_phys(owl_secondary_startup),
>>>>> +	writel(virt_to_phys(secondary_startup),
>>>>> 	       timer_base_addr + OWL_CPU1_ADDR + (cpu - 1) * 4);
>>>>
>>>> This is a kernel symbol so please use __pa_symbol() here, also you
>>>> might want to build with CONFIG_DEBUG_VIRTUAL and see if you get
>>>> other warnings about using virt_to_phys() in the owl platform code
>>>> (I did not check if there are other uses)
>>>
>>> Thanks for the report. There are no other such uses in mach-actions, but
>>> git-grep'ing for virt_to_phys in arch/arm/mach-* I spot at least one
>>> other such usage in mach-oxnas:
>>>
>>> arch/arm/mach-oxnas/platsmp.c:
>>> writel(virt_to_phys(ox820_secondary_startup),
>>>
>>> as well as this in mach-mvebu:
>>>
>>> arch/arm/mach-mvebu/platsmp.c:  writel(virt_to_phys(boot_addr), base +
>>> MV98DX3236_CPU_RESUME_ADDR_REG);
>>>
>>> and these in mach-at91:
>>>
>>> arch/arm/mach-at91/pm.c:        pm_bu->canary = virt_to_phys(&canary);
>>> arch/arm/mach-at91/pm.c:        pm_bu->resume = virt_to_phys(cpu_resume);
>>>
>> 
>> They can probably use __pa_symbol() (I must admit I didn't know about
>> it before this email)
>
> This is fine, do you mind sending fixes for the at91 parts? Gregory, can
> you also fix the mv98dx3236 platform SMP code?

Yes sure, actually, for Armada XP we already use  __pa_symbol() but from
an other file that why I didn't pay attention on it.

Gregory

>
> Thanks!
> -- 
> Florian

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com