linux-kernel - Re: [PATCH v2 1/9] ARM: correct secondary_startup

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Message-ID: <CABuKBeJwWR1+0mJkStJFNMeOsESKJCH4T1w5HTyUv5q=KAN7EA@mail.gmail.com>
Date:	Sat, 16 May 2015 11:08:36 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Pawel Moll <pawel.moll@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marc Carino <marc.ceeeee@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/9] ARM: correct secondary_startup_arm mode

2015-05-16 9:58 GMT+02:00 Yingjoe Chen <yingjoe.chen@...iatek.com>:
> secondary_startup_arm is used as ARM mode secondary start up function
> when ther kernel is compiled in THUMB mode, however the label itself
> is still in .thumb mode. readelf shows:
>
> 160979: c020a581   120 FUNC    GLOBAL DEFAULT    2 secondary_startup_arm
>
> Make sure the label is in ARM mode as well.
>
> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> ---
>  arch/arm/kernel/head.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
> index 3637973..58ee8a2 100644
> --- a/arch/arm/kernel/head.S
> +++ b/arch/arm/kernel/head.S
> @@ -346,8 +346,8 @@ __turn_mmu_on_loc:
>
>  #if defined(CONFIG_SMP)
>         .text
> -ENTRY(secondary_startup_arm)
>         .arm
> +ENTRY(secondary_startup_arm)
>   THUMB(        adr     r9, BSYM(1f)    )       @ Kernel is entered in ARM.
>   THUMB(        bx      r9              )       @ If this is a Thumb-2 kernel,
>   THUMB(        .thumb                  )       @ switch to Thumb now.

This fixes and issue we had with SMP on mt6589.

Tested-by: Matthias Brugger <matthias.bgg@...il.com>


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