> 1. OK, it fixes the UP UP_IOAPIC compilation problem.
> System (with preempt-patch) up and runnig.
Good.
> 2. Woohu. I have 8 CPUs, now...;-)
> --- /proc is somewhat broken
Bugger. Didn't realise that cpu_online_map didn't get initialised
to anything sensible under UP. Should be just cosmetic (it's only
the output of /proc/cpuinfo, not the sceduler or anything), but
try this (I haven't tested it yet - if it doesn't work, just change the
8 to 1 for a second whilst I fix it properly).
===========================
--- setup.c.old Fri Oct 5 14:20:29 2001
+++ setup.c Fri Oct 5 14:28:51 2001
@@ -2420,7 +2420,7 @@
* WARNING - nasty evil hack ... if we print > 8, it overflows the
* page buffer and corrupts memory - this needs fixing properly
*/
- for (n = 0; n < 8; n++, c++) {
+ for (n = 0; n < (clustered_apic_mode ? 8 : NR_CPUS); n++, c++) {
/* for (n = 0; n < NR_CPUS; n++, c++) { */
int fpu_exception;
#ifdef CONFIG_SMP
===========================
The reason for this hackery is that get_cpuinfo writes to a page
without proper bounds on itself. If you have more than about 8
cpus, it tramples merrily all over the next page, corrupting page
tables, etc, etc.
The real fix for this overflow was published here a few weeks ago
by James Cleverdon (whom I work with). It's in Alan's tree, but not
Linus' as yet.
M.
-
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 : Sun Oct 07 2001 - 21:00:39 EST