tree 403ad71dc1c7f00a1b3717fbe0fe1bf3554a8287
parent 4d55476c3f889e0f30d88e22da4682b5f10394ff
author Vivek Goyal <vgoyal@in.ibm.com> 1119736694 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1119741892 -0700

[PATCH] Kexec: Kexec on panic fix with nmi watchdog enabled

o Problem: Kexec on panic hangs if first kernel is booted with nmi_watchdog
  command line parameter. This problem occurs because kexec crash shutdown
  code replaces the NMI callback handler. This handler saves the cpu register
  states and halts the cpu. If system is booted with nmi_watchdog parameter,
  then crashing cpu also runs this nmi handler and halts itself.

o This patch fixes the problem by keeping a track of crashing cpu and not
  executing the new nmi handler on crashing cpu.

o There is a dependence on smp_processor_id() function which might return
  insane value for cpu, if cpu field of thread_info is corrupted.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>