linux-kernel - Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

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Message-ID: <86802c440808200102n6487ae17ud790991b8ea30d16@mail.gmail.com>
Date:	Wed, 20 Aug 2008 01:02:02 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Bill Fink" <billfink@...dspring.com>
Cc:	"David Witbrodt" <dawitbro@...global.net>,
	"Ingo Molnar" <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, netdev <netdev@...r.kernel.org>
Subject: Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

On Wed, Aug 20, 2008 at 12:51 AM, Bill Fink <billfink@...dspring.com> wrote:
> On Tue, 19 Aug 2008, Yinghai Lu wrote:
>
>> On Tue, Aug 19, 2008 at 9:51 PM, David Witbrodt <dawitbro@...global.net> wrote:
>> > While reading drivers/char/hpet.c and looking at the functions
>> > used there, I discovered request_region(), and realized that it
>> > would be difficult to compare the entire iomem_resource tree to
>> > a dummy tree only containing resources added by insert_resource()
>> > and request_resource().  It might be simpler to have my tiny
>> > e820_reserve_resources() replacement add each resource to 3 trees
>> > -- the real iomem_resource tree, and 2 dummy trees -- which could
>> > then be compared for differences just before the kernel locks up.
>>
>> with reverting patch that change insert_resource to request_resource...
>> 2.6.26 or 2.6.27-rcX still hange somewhere.
>
> This is true if he reverted just the 3def3d6d... commit, but if he
> also reverts the similar, and immediately following, 1e934dda...
> commit, then his 2.6.26 kernel runs fine.

interesting,

David, can you try only comment out

late_initcall(lapic_insert_resource);

YH
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