linux-kernel - RE: [PATCHv1 09/12] unicore32 core architecture: timer and time

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Message-ID: <1294084733.2571.54.camel@work-vm>
Date:	Mon, 03 Jan 2011 11:58:53 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Guan Xuetao <guanxuetao@...c.pku.edu.cn>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCHv1 09/12] unicore32 core architecture: timer and time

On Mon, 2011-01-03 at 13:52 +0800, Guan Xuetao wrote: 
> > When using clocksource_register_hz(&cksrc_puv3_oscr, CLOCK_TICK_RATE ),
> >  the shift value become 0, and mult value become 0x838a91a7, and the system will be broken
> > after printing "Switching to clocksource oscr".
> > 
> > When using clocksource_register_khz(&cksrc_puv3_oscr, CLOCK_TICK_RATE ),
> > the shift value become 0, and mult value become  0x4359611, and the system will run smoothly,
> > but timer interrupt seems too frequently. Perhaps it is 4 times faster.
> > 
> > For comparison, originally, when shift value is set to 0x12, the mult value become 1175e5e.
> > 
> 
> The error is the implementation of do_div() function.
> When replacing the arch-specific div64.h with asm-generic/div64.h, clocksource_rigister_hz() works.

Oh great! You had me worried I had a bug in the mult/shift calculation.

Great to hear all is working now! If you run into other clock/time
related troubles, please let me know.

thanks
-john



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