[PATCH 2.6.17-rc1-mm1] sched_domain-handle-kmalloc-failure-fix

[Lee Schermerhorn]

[PATCH] sched_domain-handle-kmalloc-failure-fix

2.6.17-rc1-mm1 hangs during boot on HP rx8620 and dl585 -- both 4 node
NUMA platforms.  Problem is in build_sched_domains() setting up the
sched_group_nodes[] lists, resulting from patch:
sched_domain-handle-kmalloc-failure.patch

The referenced patch does not propagate the "next" pointer from the head
of the list, resulting in a loop between the last 2 groups in the list.
This causes a tight loop/hang in init_numa_sched_groups_power() because 
'sg->next' never == 'group_head' when you have > 2 nodes.

This patch seems to fix the problem.  

Signed-off-by:  Lee Schermerhorn <lee.schermerhorn@xxxxxx>

Index: linux-2.6.17-rc1-mm1/kernel/sched.c
===================================================================
--- linux-2.6.17-rc1-mm1.orig/kernel/sched.c	2006-04-06 15:18:32.000000000 -0400
+++ linux-2.6.17-rc1-mm1/kernel/sched.c	2006-04-06 15:20:49.000000000 -0400
@@ -6360,7 +6360,7 @@ static int build_sched_domains(const cpu
 			}
 			sg->cpu_power = 0;
 			sg->cpumask = tmp;
-			sg->next = prev;
+			sg->next = prev->next;
 			cpus_or(covered, covered, tmp);
 			prev->next = sg;
 			prev = sg;


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