linux-kernel - Re: [PATCH v4 7/7] arm/arm64: Unexport restart handlers

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Date:	Mon, 14 Jul 2014 15:22:32 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Will Deacon <Will.Deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Heiko Stuebner <heiko@...ech.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-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 7/7] arm/arm64: Unexport restart handlers

On Sun, Jul 13, 2014 at 04:30:31PM +0100, Guenter Roeck wrote:
> Implementing a restart handler in a module don't make sense
> as there would be no guarantee that the module is loaded when
> a restart is needed. Unexport arm_pm_restart to ensure that
> no one gets the idea to do it anyway.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v4: No change
> v3: No change
> v2: No change
> 
>  arch/arm/kernel/process.c   | 1 -
>  arch/arm64/kernel/process.c | 1 -
>  2 files changed, 2 deletions(-)
> 
> diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
> index 5d191e3..25c7f00 100644
> --- a/arch/arm/kernel/process.c
> +++ b/arch/arm/kernel/process.c
> @@ -125,7 +125,6 @@ void (*pm_power_off)(void);
>  EXPORT_SYMBOL(pm_power_off);
>  
>  void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd) = null_restart;
> -EXPORT_SYMBOL_GPL(arm_pm_restart);

Unless I miss something, how is this different from registering a
restart notifier from a module (blocking_notifier_chain_register is
exported)?

-- 
Catalin
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