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

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Date:   Thu, 6 Jul 2017 19:38:41 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Andreas Färber <afaerber@...e.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        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>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        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()

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)


-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com