linux-kernel - Re: [PATCH] h8300 trivial conversion to GENERIC

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Date:	Wed, 11 Apr 2007 12:35:33 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	john stultz <johnstul@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] h8300 trivial conversion to GENERIC_TIME

At Tue, 10 Apr 2007 16:25:00 -0700,
john stultz wrote:
> 
> Here is a trivial conversion of the h8300 arch to the GENERIC_TIME
> infrastructure (h8300 does not have better then jiffies resolution, so
> there are no clocksources to add). I have not tested this at all, but it
> seems pretty straight forward
> 
> I'd appreciate any comments or feedback!
> 
> thanks
> -john
>

There will not be a problem.
Because it is a place working now, I correct it if there 
was a problem. 

> 
> Signed-off-by: John Stultz <johnstul@...ibm.com>
Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
 
> 
> diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
> index 1734d96..86f6ca3 100644
> --- a/arch/h8300/Kconfig
> +++ b/arch/h8300/Kconfig
> @@ -53,6 +53,10 @@ config GENERIC_CALIBRATE_DELAY
>  	bool
>  	default y
>  
> +config GENERIC_TIME
> +	bool
> +	default y
> +
>  config TIME_LOW_RES
>  	bool
>  	default y
> diff --git a/arch/h8300/kernel/time.c b/arch/h8300/kernel/time.c
> index d1ef615..91d3b56 100644
> --- a/arch/h8300/kernel/time.c
> +++ b/arch/h8300/kernel/time.c
> @@ -66,55 +66,3 @@ void time_init(void)
>  
>  	platform_timer_setup(timer_interrupt);
>  }
> -
> -/*
> - * This version of gettimeofday has near microsecond resolution.
> - */
> -void do_gettimeofday(struct timeval *tv)
> -{
> -	unsigned long flags;
> -	unsigned long usec, sec;
> -
> -	read_lock_irqsave(&xtime_lock, flags);
> -	usec = 0;
> -	sec = xtime.tv_sec;
> -	usec += (xtime.tv_nsec / 1000);
> -	read_unlock_irqrestore(&xtime_lock, flags);
> -
> -	while (usec >= 1000000) {
> -		usec -= 1000000;
> -		sec++;
> -	}
> -
> -	tv->tv_sec = sec;
> -	tv->tv_usec = usec;
> -}
> -
> -EXPORT_SYMBOL(do_gettimeofday);
> -
> -int do_settimeofday(struct timespec *tv)
> -{
> -	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
> -		return -EINVAL;
> -
> -	write_lock_irq(&xtime_lock);
> -	/* This is revolting. We need to set the xtime.tv_usec
> -	 * correctly. However, the value in this location is
> -	 * is value at the last tick.
> -	 * Discover what correction gettimeofday
> -	 * would have done, and then undo it!
> -	 */
> -	while (tv->tv_nsec < 0) {
> -		tv->tv_nsec += NSEC_PER_SEC;
> -		tv->tv_sec--;
> -	}
> -
> -	xtime.tv_sec = tv->tv_sec;
> -	xtime.tv_nsec = tv->tv_nsec;
> -	ntp_clear();
> -	write_sequnlock_irq(&xtime_lock);
> -	clock_was_set();
> -	return 0;
> -}
> -
> -EXPORT_SYMBOL(do_settimeofday);
> 
-
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