linux-kernel - Re: [PATCH] USB: improve ehci_watchdog's side effect in CPU power management

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Message-ID: <Pine.LNX.4.44L0.0810081008510.2498-100000@iolanthe.rowland.org>
Date:	Wed, 8 Oct 2008 10:11:36 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Yi Yang <yi.y.yang@...el.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <dbrownell@...rs.sourceforge.net>,
	<gregkh@...e.de>, <linux-usb@...r.kernel.org>,
	<leonidv11@...il.com>
Subject: Re: [PATCH] USB: improve ehci_watchdog's side effect in CPU power
 management

On Wed, 8 Oct 2008, Yi Yang wrote:

> CC to Alan Stern and Leonid, maybe they know why "ï»¿t =
> DIV_ROUND_UP(EHCI_SHRINK_FRAMES * HZ, 1000) + 1".

The "DIV_ROUND_UP(EHCI_SHRINK_FRAMES * HZ, 1000)" converts from 
milliseconds to jiffies.  It could easily be replaced with 
msecs_to_jiffies().

The "+ 1" part is there to prevent ties, in case the conversion just
happens to be exact.

Alan Stern

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