Message-Id: <200603280537.k2S5bLvZ012916@turing-police.cc.vt.edu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Greg Lee <glee@swspec.com>, linux-kernel@vger.kernel.org,
       rmk+kernel@arm.linux.org.uk
Subject: Re: HZ != 1000 causes problem with serial device shown by git-bisect 
In-Reply-To: Your message of "Mon, 27 Mar 2006 20:27:19 EST."
             <1143509240.1792.337.camel@mindpipe> 
From: Valdis.Kletnieks@vt.edu
References: <0e6601c651f8$9d253b40$a100a8c0@casabyte.com>
            <1143509240.1792.337.camel@mindpipe>
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Date: Tue, 28 Mar 2006 00:37:21 -0500
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On Mon, 27 Mar 2006 20:27:19 EST, Lee Revell said:
> On Mon, 2006-03-27 at 18:46 -0500, Greg Lee wrote:
> > I have also tried a number of other kernels and the problem exists all
> > the way to 2.6.15.6
> > but is fixed in 2.6.16, so I am going to git-bisect 2.6.15.6 to
> > 2.6.16, but I thought I
> > would get this message out now in case someone has an inkling of what
> > the problem is. 
> 
> If it's fixed in 2.6.16, what's the problem?  It's not as if we can go
> back and fix those old kernels...

I may be misreading Greg's concern, but I got the feeling that he's worried
that 2.6.16 isn't *really* fixed, but that something is just papering over the
driver's innate displeasure with HZ==250 (and thus it's likely that in .17 or
.18 or whenever, some *other* patch will make it re-manifest).

And we've seen *enough* bugs that only manifest in even or odd or
divisible-by-7.48 kernels that we know that "it works in 2.6.16" is vastly
different than being able to point at a changeset (or even a stream of fixes)
and say "fixed by that" or "probably went away when this stream of patches
totally reworked the code".


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