dcache BUG()

[Brian Kuschak]

Dan,

Just to be clear, we do have several active subscriptions with MontaVista,
and have contacted them numerous times in the past month about this issue.
Unfortunately they were unable to provide a solution.  This kernel was the
latest that MontaVista had for the 4xx as of 3/7/2001.  This was the 2.4.2
kernel.  I applied the 2.4.3 patch to bring it up to date with the latest
bugfixes.  The version as report in /proc/version:  Linux version
2.4.3-mvista_010303.

I looked at the atomic.h code and think I found one bug, however it doesn't
solve my problem.  See if this patch makes sense to you.  Looks like a typo
when the atomic_* functions were converted from assembler to inline.  The
bne should be 'bne-' for the atomic decrement operation.

Regards,
Brian

*** atomic.h    2001/02/26 19:07:19     1.1.1.2
--- atomic.h    2001/05/07 21:13:54
***************
*** 86,94 ****

        __asm__ __volatile__("\n\
  1:    lwarx   %0,0,%2\n\
        addic   %0,%0,-1\n\
        stwcx.  %0,0,%2\n\
!       bne     1b"
        : "=&r" (t), "=m" (v->counter)
        : "r" (v), "m" (v->counter)
        : "cc");
--- 88,96 ----

        __asm__ __volatile__("\n\
  1:    lwarx   %0,0,%2\n\
        addic   %0,%0,-1\n\
        stwcx.  %0,0,%2\n\
!       bne-    1b"
        : "=&r" (t), "=m" (v->counter)
        : "r" (v), "m" (v->counter)
        : "cc");



-----Original Message-----
From: Dan Malek [mailto:dan at mvista.com]
Sent: Monday, May 07, 2001 2:05 PM
To: Eli Chen
Cc: Brian Kuschak; linuxppc-embedded at lists.linuxppc.org
Subject: Re: dcache BUG()


Eli Chen wrote:

> I have also seen the dcache BUG, as well as bugs and warnings from other
> parts of the kernel in the MontaVista 2.4.0 kernel.

Again, I don't know what a "MontaVista 2.4.0" kernel would be.
MontaVista clearly names our software distributions and releases
them on a CD after a QA process.  If you can duplicate this
problem with the software that is on the CD, and then use the
proper reference name, we could all use the same baseline.  Of
course, it would be nicer if you would have purchased the subscription
with the CD and called your dedicated technical representative,
but we'll provide the best free help available now :-).



	-- Dan

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