tree c0ea708310452d42b35ea3eb422654fc4fd1f778
parent fec6ed1d1f9b78a6acb4a3eb2c46c812ac2e96f0
author Jan Kiszka <jan.kiszka@siemens.com> 1223319059 -0500
committer Jason Wessel <jason.wessel@windriver.com> 1223319059 -0500

kgdb, x86: Avoid invoking kgdb_nmicallback twice per NMI

Stress-testing KVM's latest NMI support with kgdbts inside an SMP guest,
I came across spurious unhandled NMIs while running the singlestep test.
Looking closer at the code path each NMI takes when KGDB is enabled, I
noticed that kgdb_nmicallback is called twice per event: One time via
DIE_NMI_IPI notification, the second time on DIE_NMI. Removing the first
invocation cures the unhandled NMIs here.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>