linux-kernel - Re: [PATCH 23/31] mips/sgi-ip32: Use separate static data field with with static timer

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Message-ID: <20170901070435.GB32117@linux-mips.org>
Date:   Fri, 1 Sep 2017 09:04:35 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 23/31] mips/sgi-ip32: Use separate static data field with
 with static timer

On Thu, Aug 31, 2017 at 04:29:35PM -0700, Kees Cook wrote:

> In preparation for changing the timer callback argument to the timer
> pointer, move to a separate static data variable.
> 
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: linux-mips@...ux-mips.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  arch/mips/sgi-ip32/ip32-reset.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/mips/sgi-ip32/ip32-reset.c b/arch/mips/sgi-ip32/ip32-reset.c
> index 4e263fd4deff..6636a9c686cd 100644
> --- a/arch/mips/sgi-ip32/ip32-reset.c
> +++ b/arch/mips/sgi-ip32/ip32-reset.c
> @@ -38,6 +38,7 @@
>  extern struct platform_device ip32_rtc_device;
>  
>  static struct timer_list power_timer, blink_timer;
> +static unsigned long blink_timer_timeout;

Similar to the IP22 patch this patch removes power_timer ...

>  static int has_panicked, shutting_down;
>  
>  static __noreturn void ip32_poweroff(void *data)
> @@ -71,11 +72,11 @@ static void ip32_machine_restart(char *cmd)
>  	unreachable();
>  }
>  
> -static void blink_timeout(unsigned long data)
> +static void blink_timeout(unsigned long unused)
>  {
>  	unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
>  	mace->perif.ctrl.misc = led;
> -	mod_timer(&blink_timer, jiffies + data);
> +	mod_timer(&blink_timer, jiffies + blink_timer_timeout);
>  }
>  
>  static void ip32_machine_halt(void)
> @@ -99,8 +100,8 @@ void ip32_prepare_poweroff(void)
>  	}
>  
>  	shutting_down = 1;
> -	blink_timer.data = POWERDOWN_FREQ;
> -	blink_timeout(POWERDOWN_FREQ);
> +	blink_timer_timeout = POWERDOWN_FREQ;
> +	blink_timeout(0);
>  
>  	setup_timer(&power_timer, power_timeout, 0UL);

... but doesn't fix the users.

>  	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
> @@ -120,8 +121,8 @@ static int panic_event(struct notifier_block *this, unsigned long event,
>  	led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
>  	mace->perif.ctrl.misc = led;
>  
> -	blink_timer.data = PANIC_FREQ;
> -	blink_timeout(PANIC_FREQ);
> +	blink_timer_timeout = PANIC_FREQ;
> +	blink_timeout(0);
>  
>  	return NOTIFY_DONE;
>  }
> @@ -142,8 +143,7 @@ static __init int ip32_reboot_setup(void)
>  	_machine_halt = ip32_machine_halt;
>  	pm_power_off = ip32_machine_halt;
>  
> -	init_timer(&blink_timer);
> -	blink_timer.function = blink_timeout;
> +	setup_timer(&blink_timer, blink_timeout, 0);
>  	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
>  
>  	return 0;

  Ralf