Hi Peter,

Surely this isn't the first multi-node P7 to boot a kernel with this
patch? If my git foo is any good it hit -next on 23rd of May.

I guess I'm asking is, do smaller P7 machines boot? And if so, is
there any difference except size?

How many nodes does the thing have anyway, 28? Hmm, that could mean
its the first machine with >16 nodes to boot this, which would make it
trigger the magic ALL_NODES crap.

We haven't tested a box with more than 16 nodes in quite a while, so it
may be this.

I took a quick look and we are stuck in update_group_power:

        do {
                power += group->cpu_power;
                group = group->next;
        } while (group != child->groups);

I looked at the linked list:

child->groups = c000007b2f74ff00

and dumping group as we go:

c000007b2f74ff00 c000007b2f760000 c000007b2fb60000 c000007b2ff60000

at this point we end up in a cycle and never make it back to
child->groups:

c000008b2e68ff00 c000008b2e6a0000 c000008b2eaa0000 c000008b2eea0000
c000009aee77ff00 c000009aee790000 c000009aeeb90000 c000009aeef90000
c00000bafde91800 c00000dafdf81800 c00000fafce81800 c000011afdf71800
c00001226e70ff00 c00001226e720000 c00001226eb20000 c00001226ef20000
c000008b2e68ff00

Still investigating

Anton