From: Ralf Baechle <ralf@linux-mips.org>
To: Peter Horton <phorton@bitbox.co.uk>
Cc: linux-mips@linux-mips.org
Subject: Re: Kernel 2.4.23 on Cobalt Qube2 - area of problem
Date: Sat, 13 Dec 2003 18:07:51 +0100 [thread overview]
Message-ID: <20031213170751.GB13271@linux-mips.org> (raw)
In-Reply-To: <3FD99C34.9090001@bitbox.co.uk>
On Fri, Dec 12, 2003 at 10:45:08AM +0000, Peter Horton wrote:
> More info on the random segmentation faults and data corruption on my Qube2.
>
> 2.4.21 from CVS is the first kernel to exhibit the problem. I tracked it
> down to the cache handling changes that went in between 2.4.20 and 2.4.21.
>
> By (not very scientifically) removing flush_dcache_page() and
> re-instating flush_page_to_ram() I managed to get the 2.4.21 kernel
> stable (see attached patch). Applying a similiar patch to 2.4.23 (CVS
> HEAD) allows me to run 2.4.23 too.
>
> I don't know how to track the problem any further - the kernel's cache
> handling is a bit out of my league.
>
> Anyone got a clue stick they can point me in the right direction with ?
Can you put a printk into c-r4k.c and print the value of the
shm_align_mask variable? I want to make sure it's got a sane value on
your box. Also the first few lines of your bootup messages with the
processor and cache stuff would be useful.
Ralf
next prev parent reply other threads:[~2003-12-13 17:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-12 10:45 Kernel 2.4.23 on Cobalt Qube2 - area of problem Peter Horton
2003-12-13 17:07 ` Ralf Baechle [this message]
2003-12-13 18:20 ` Peter Horton
2003-12-13 18:38 ` Peter Horton
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