From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3BA8772C.CDF5D0AB@raleigh.ibm.com> Date: Wed, 19 Sep 2001 06:45:00 -0400 From: Ralph Blach MIME-Version: 1.0 To: Mark Hatle Cc: David Gibson , linuxppc-embedded@lists.linuxppc.org Subject: Re: Errata 67/77 / walnut bugs (was: Re: Erratum 51 bugfix?) References: <20010917152316.O3851@zax> <3BA62583.55E48A97@mvista.com> <20010918102901.A1183@zax> <3BA7980B.EEBF1F5D@mvista.com> <20010919121954.D13693@zax> <3BA801A9.B6311C93@mvista.com> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: 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/