From: Jean Delvare <khali@linux-fr.org>
To: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mmap() on cdrom files fails in 2.6.9-rc2-mmX
Date: Sat, 2 Oct 2004 18:48:28 +0200 [thread overview]
Message-ID: <20041002184828.2d9fefda.khali@linux-fr.org> (raw)
In-Reply-To: <20041002004221.33510f46.akpm@osdl.org>
> Jean Delvare <khali@linux-fr.org> wrote:
> >
> > I think I found a bug in 2.6.9-rc2-mm4. It doesn't seem to be able
> > to mmap() files located on cdroms. Same problem with -mm3 and -mm1.
> > 2.6.9-rc2 works fine. I reproduced it on two completely different
> > systems, so I guess it isn't device dependant.
> >
>
> So I tried your .config
>
> > ...
> > # CONFIG_BLK_DEV_IDECD is not set
>
> hm. You're not using an IDE CDROM?
>
> > CONFIG_BLK_DEV_SR=m
>
> but you are using a SCSI CDROM, correct?
Correct, on my desktop system. However, I have a laptop with an IDE
CDROM, and am able to reproduce the problem there with 2.6.9-rc2-mm1.
> I tried your test app on both IDE CD with my .config and on SCSI CD
> with your .config. Works fine.
Mmm, that's odd. There is next to nothing in common between my two
systems (desktop is AMD-based with VIA chipset and SYM/NCR SCSI adapter,
laptop is Intel-based with Intel chipset). Oh, the only common point I
can think of is the underlying Linux distro, namely up-to-date Slackware
9.1.
...
Being admittedly lost, I decided to do the only thing I could...
Starting from 2.6.9-rc2-bk1, I incrementally applied all changesets from
bk1 to bk2 as found on linux.bkbits.net:8080/linux-2.5, and test each
time. I wasted quite a few hours on this, but not in vain. The changeset
triggering the problem is this one:
http://linux.bkbits.net:8080/linux-2.5/cset@1.1891
It looks totally unrelated. As to why it causes a problem to only me,
don't ask, I have no idea.
Does it help?
Thanks.
--
Jean Delvare
http://khali.linux-fr.org/
prev parent reply other threads:[~2004-10-02 16:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-28 19:42 mmap() on cdrom files fails in 2.6.9-rc2-mmX Jean Delvare
2004-09-30 18:49 ` Bill Davidsen
2004-10-02 7:42 ` Andrew Morton
2004-10-02 16:48 ` Jean Delvare [this message]
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