linux-kernel - Re: HPET regression in 2.6.26 versus 2.6.25 -- experimental revert for 2.6.27 failed

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Message-ID: <86802c440808121731y5481cf44m54990b88395483c4@mail.gmail.com>
Date:	Tue, 12 Aug 2008 17:31:07 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"David Witbrodt" <dawitbro@...global.net>
Cc:	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"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 -- experimental revert for 2.6.27 failed

On Tue, Aug 12, 2008 at 5:00 PM, David Witbrodt <dawitbro@...global.net> wrote:
> SUMMARY
>
> 1.  Ran 'git remote update', then built kernels for origin/master
> (Linus' linux-2.6 tree) and tip/master.  Both froze.
>
> 2.  Attempted a revert against tip/master, but the files involved
> changed quite a bit.  I _was_ able to build the kernel successfully,
> but it froze.  There have simply been too many changes since Feb. 22
> for my naive approach to work.
>
> 3.  When the revert failed, I panicked:  I thought that I might
> truly have made a mistake with the original 'git bisect' process
> I carried out.  After retracing the last few iterations of the
> process -- building and checking the last 3 kernels -- I found
> that the information I posted here WAS correct:  the problem
> commit # was the one I had found the first time.
>
> 4.  To see if I am totally incompetent, I used git to checkout the
> version of the sources at the problem commit, and then reverted
> those changes (same method used in step 2).  The kernel built
> and ran just fine:  no freeze, no need for "hpet=disabled".

can you post /proc/iomem?

YH
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