linux-kernel - Re: [PATCH v6 3/7] arm: Support restart through restart handler call chain

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Message-ID: <2985231.leR3BbmHFl@diego>
Date:	Sat, 09 Aug 2014 22:01:21 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-watchdog@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Wim Van Sebroeck <wim@...ana.be>,
	Catalin Marinas <catalin.marinas@....com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	Jonas Jensen <jonas.jensen@...il.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Tomasz Figa <t.figa@...sung.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/7] arm: Support restart through restart handler call chain

Hi Guenter,

Am Montag, 4. August 2014, 18:48:54 schrieb Guenter Roeck:
> The kernel core now supports a restart handler call chain for system
> restart functions.
> 
> With this change, the arm_pm_restart callback is now optional, so check
> if it is set before calling it. Only call the kernel restart handler
> if arm_pm_restart is not set.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Acked-by: Heiko Stuebner <heiko@...ech.de>
> ---
> v6: No change.
> v5: Renamed restart function to do_kernel_restart
> v4: No change.
> v3: Use wrapper function to execute notifier call chain.
> v2: Only call notifier call chain if arm_pm_restart is not set.
>     Do not include linux/watchdog.h.
> 
>  arch/arm/kernel/process.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
> index 81ef686..84ca0d5 100644
> --- a/arch/arm/kernel/process.c
> +++ b/arch/arm/kernel/process.c
> @@ -230,7 +230,10 @@ void machine_restart(char *cmd)
>  	local_irq_disable();
>  	smp_send_stop();
> 
> -	arm_pm_restart(reboot_mode, cmd);
> +	if (arm_pm_restart)
> +		arm_pm_restart(reboot_mode, cmd);
> +	else
> +		do_kernel_restart(cmd);
> 
>  	/* Give a grace period for failure to restart of 1s */
>  	mdelay(1000);

shouldn't you also get rid of 

	void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd) = null_restart;

like a previous attempt at unifying the restart handling [0] did.

Because when testing the current series on my Rockchip boards, there was
always an arm_pm_restart defined ... namely the null_restart mentioned above.
So do_kernel_restart is never reached until I disable the null_restart.


Heiko


[0] http://permalink.gmane.org/gmane.linux.ports.arm.kernel/277042

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