From: Ralph Blach <rcblach@raleigh.ibm.com>
To: Mark Hatle <fray@mvista.com>
Cc: David Gibson <david@gibson.dropbear.id.au>,
linuxppc-embedded@lists.linuxppc.org
Subject: Re: Errata 67/77 / walnut bugs (was: Re: Erratum 51 bugfix?)
Date: Wed, 19 Sep 2001 06:45:00 -0400 [thread overview]
Message-ID: <3BA8772C.CDF5D0AB@raleigh.ibm.com> (raw)
In-Reply-To: 3BA801A9.B6311C93@mvista.com
The fix must be used for each stwcx.
Chip
IBM Microelectronics.
Mark Hatle wrote:
>
> David Gibson wrote:
> >
> > Ah, yes, I discovered ATOMIC_SYNC_FIX after I sent that, and have now
> > turned it on. That should certainly fix the atomic ops, however there
> > are quite a number of other places where the kernel uses stwcx., which
> > ATOMIX_SYNC_FIX doesn't fix - notably arch/ppc/kernel/bitops.c and
> > include/asm-ppc/bitops.h. As well as activating ATOMIX_SYNC_FIX I
> > tried inserting a sync before every other stwcx. that I could find,
> > and I haven't managed to get a process to lock up yet.
>
> Just as an FYI, we also do this in glibc to be safe. We have never been
> able to pin down a problem in userspace due to this bug, but we thought
> it would be better safe then sorry until we can get definative proof
> that the bug will not happen in userspace.
>
> The following two files in glibc should be patched:
> linuxthreads/sysdeps/powerpc/pt-machine.h
> sysdeps/powerpc/atomicity.h
>
> --Mark
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2001-09-19 10:45 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-17 5:23 Erratum 51 bugfix? David Gibson
2001-09-17 16:32 ` Dan Malek
2001-09-18 0:29 ` Errata 67/77 / walnut bugs (was: Re: Erratum 51 bugfix?) David Gibson
2001-09-18 18:52 ` Dan Malek
2001-09-19 2:19 ` David Gibson
2001-09-19 2:23 ` Mark Hatle
2001-09-19 6:41 ` Dan Malek
2001-09-19 10:45 ` Ralph Blach [this message]
2001-09-19 6:39 ` Dan Malek
2001-09-21 4:36 ` David Gibson
2001-09-21 5:23 ` Dan Malek
2001-09-21 5:33 ` David Gibson
2001-09-21 6:24 ` Dan Malek
2001-09-21 8:04 ` Dan Malek
-- strict thread matches above, loose matches on Subject: below --
2002-07-20 6:23 dank
2002-07-20 15:14 ` Mark Hatle
2002-07-20 15:38 ` dank
2002-07-20 16:02 ` Mark Hatle
2002-07-20 17:57 ` dank
2002-07-23 12:39 ` dank
2002-07-23 13:10 ` Mark Hatle
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