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

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Message-ID: <3F3740FC-3873-4C01-A625-C8DC7F50A018@gmail.com>
Date:   Tue, 04 Jul 2017 19:36:32 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org,
        Andreas Färber <afaerber@...e.de>
CC:     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>
Subject: Re: [PATCH] ARM: owl: smp: Drop owl_secondary_boot()

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)

-- 
Florian