linux-kernel - Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with with static timer

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Date:   Fri, 1 Sep 2017 08:59:47 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        James Hogan <james.hogan@...tec.com>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with
 with static timer

On Thu, Aug 31, 2017 at 04:29:36PM -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: James Hogan <james.hogan@...tec.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
> Cc: linux-mips@...ux-mips.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  arch/mips/sgi-ip22/ip22-reset.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/mips/sgi-ip22/ip22-reset.c b/arch/mips/sgi-ip22/ip22-reset.c
> index 196b041866ac..5cc32610e6d3 100644
> --- a/arch/mips/sgi-ip22/ip22-reset.c
> +++ b/arch/mips/sgi-ip22/ip22-reset.c
> @@ -38,6 +38,7 @@
>  #define PANIC_FREQ		(HZ / 8)
>  
>  static struct timer_list power_timer, blink_timer, debounce_timer;
> +static unsigned long blink_timer_timeout;

You're removing power_timer and debounce_timer ...

>  #define MACHINE_PANICED		1
>  #define MACHINE_SHUTTING_DOWN	2
> @@ -86,13 +87,13 @@ static void power_timeout(unsigned long data)
>  	sgi_machine_power_off();
>  }
>  
> -static void blink_timeout(unsigned long data)
> +static void blink_timeout(unsigned long unused)
>  {
>  	/* XXX fix this for fullhouse  */
>  	sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
>  	sgioc->reset = sgi_ioc_reset;
>  
> -	mod_timer(&blink_timer, jiffies + data);
> +	mod_timer(&blink_timer, jiffies + blink_timer_timeout);
>  }
>  
>  static void debounce(unsigned long data)
> @@ -128,8 +129,8 @@ static inline void power_button(void)
>  	}
>  
>  	machine_state |= MACHINE_SHUTTING_DOWN;
> -	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 don't remove the reference to power_timer nor use of debounce_timer.

>  	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
> @@ -169,8 +170,8 @@ static int panic_event(struct notifier_block *this, unsigned long event,
>  		return NOTIFY_DONE;
>  	machine_state |= MACHINE_PANICED;
>  
> -	blink_timer.data = PANIC_FREQ;
> -	blink_timeout(PANIC_FREQ);
> +	blink_timer_timeout = PANIC_FREQ;
> +	blink_timeout(0);
>  
>  	return NOTIFY_DONE;
>  }
> @@ -193,8 +194,7 @@ static int __init reboot_setup(void)
>  		return res;
>  	}
>  
> -	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