In my original patch to support MCA in kdump, changes were made to
kdump_init_notifier() of arch/ia64/kernel/crash.c. But one change
was somehow incorrectly modified in 2.6.20 to as below:

>        if ((val == DIE_INIT_MONARCH_ENTER || DIE_INIT_SLAVE_ENTER) &&
>                 nd->sos->rv_rc == 1)
>                return NOTIFY_DONE;

Since DIE_INIT_SLAVE_ENTER is a non-zero value, thus "nd->sos->rv_rc
==1" is always evaluated. The kdump kernel aborted because nd->sos
is NULL in (at least some) MCA cases.

This patch corrects the problem. It was created against 2.6.21-rc4.

Signed-Off-By: Jay Lan <jlan@sgi.com>