On Wed, Feb 13, 2002 at 06:37:14PM +1100, Paul Mackerras wrote:
> I am looking at the updates for PPC that are needed because of the
> changes to the scheduler in 2.5.x. I need to implement
> smp_migrate_task(), but I do not have another IPI easily available;
> the Open PIC interrupt controller used in a lot of SMP PPC machines
> supports 4 IPIs in hardware and we are already using all of them.
I had only one IPI for the RPIC (an interrupt controller only used on
Synergy PPC boards) and I implemented a little message queue to
simulate all 4 IPI's. The mailbox implementation suggested by James
Bottomley ended up having race conditions on our board. It's probably
not the most elegant solution, but it works and required no change to
the PowerPC SMP code. See my "Make Gemini boot" patch to linuxppc-dev
and take a look at the files rpic.c and rpic.h.
-VAL
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Feb 15 2002 - 21:01:04 EST