Re: [PATCH 2/2] [MIPS] add DECstation DS1287 clockevent

[Atsushi Nemoto <anemo@xxxxxxxxxxxxx>]

On Wed, 23 Apr 2008 08:52:45 +0900, Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx> wrote:
> add DECstation DS1287 clockevent
> 
> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
...
> --- linux-orig/arch/mips/kernel/Makefile	2008-04-22 19:01:43.957134178 +0900
> +++ linux/arch/mips/kernel/Makefile	2008-04-22 18:03:05.427649422 +0900
> @@ -9,8 +9,9 @@ obj-y		+= cpu-probe.o branch.o entry.o g
>  		   time.o topology.o traps.o unaligned.o
>  
>  obj-$(CONFIG_CEVT_BCM1480)	+= cevt-bcm1480.o
> -obj-$(CONFIG_CEVT_R4K)		+= cevt-r4k.o
> +obj-$(CONFIG_CEVT_DS1287)	+= cevt-ds1287.o
>  obj-$(CONFIG_CEVT_GT641XX)	+= cevt-gt641xx.o
> +obj-$(CONFIG_CEVT_R4K)		+= cevt-r4k.o
>  obj-$(CONFIG_CEVT_SB1250)	+= cevt-sb1250.o
>  obj-$(CONFIG_CEVT_TXX9)		+= cevt-txx9.o
>  obj-$(CONFIG_CSRC_BCM1480)	+= csrc-bcm1480.o

Why CONFIG_CEVT_R4K line was moved?  The order is important?

> --- linux-orig/arch/mips/kernel/cevt-ds1287.c	1970-01-01 09:00:00.000000000 +0900
> +++ linux/arch/mips/kernel/cevt-ds1287.c	2008-04-22 18:03:05.455637018 +0900
...
> +static void ds1287_set_mode(enum clock_event_mode mode,
> +			    struct clock_event_device *evt)
> +{
> +	unsigned long flags;
> +	u8 val;
> +
> +	spin_lock_irqsave(&rtc_lock, flags);

You do not have to use irqsave here, while set_mode is always called
with interrupts disabled.  And for rtc_lock ... I don't know if this
code could be used on SMP :-)

> --- linux-orig/include/asm-mips/dec/ds1287.h	1970-01-01 09:00:00.000000000 +0900
> +++ linux/include/asm-mips/dec/ds1287.h	2008-04-22 18:03:05.455637018 +0900
> @@ -0,0 +1,27 @@
...

I suppose CEVT_DS1287 is not DEC specific one.  If so,
include/asm-mips/ would be better place.

---
Atsushi Nemoto