tree 9bfd0f45824748cbf3287a82b4449e6e18f25332
parent 5033cba087f6ac773002123aafbea1aad4267682
author Eric W. Biederman <ebiederm@xmission.com> 1119736678 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1119741889 -0700

[PATCH] crashdump: x86: add NMI handler to capture other CPUs

One of the dangers when switching from one kernel to another is what happens
to all of the other cpus that were running in the crashed kernel.  In an
attempt to avoid that problem this patch adds a nmi handler and attempts to
shoot down the other cpus by sending them non maskable interrupts.

The code then waits for 1 second or until all known cpus have stopped running
and then jumps from the running kernel that has crashed to the kernel in
reserved memory.

The kernel spin loop is used for the delay as that should behave continue to
be safe even in after a crash.

Signed-off-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>