linux-kernel - Re: [PATCH] x86: set percpu cpu0 lpj to default

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Message-ID: <4D30CE56.2030704@kernel.org>
Date:	Fri, 14 Jan 2011 14:29:42 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Greg KH <greg@...ah.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Christoph Lameter <cl@...ux.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] x86: set percpu cpu0 lpj to default

On 01/14/2011 02:16 PM, Greg KH wrote:
> On Fri, Jan 14, 2011 at 01:22:32PM -0800, Yinghai Lu wrote:
>>
>> We need to use udelay() in early stage.
> 
> I still don't agree with this.
> 
> Again, _please_ post your real patches that require this, after
> explaining exactly _why_ this is needed at all, and what real problem it
> is solving.
> 
> You seem to be totally ignoring this request I've made numerous times,
> which isn't appreciated at all.  So I'm guessing that we should also
> ignore your patches as well?

Please forget about those patches about disabling USB legacy early now.

the one is because 

echi debug port early serial console in drivers/usb/early/ehci-dbgp.c

is using udelay() in early stage.

and now udelay is relying to use loops_per_jiffy in per cpu area that not set yet.

Yinghai
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