tree d57e22648d1e07659db308abdcb8d5b23d63891f
parent 4e6ea1440c67de32d7c89aacf233472dfc3bce82
author Steven Rostedt <srostedt@redhat.com> 1233899497 -0500
committer Steven Rostedt <srostedt@redhat.com> 1234054883 -0500

nmi: add generic nmi tracking state

This code adds an in_nmi() macro that uses the current tasks preempt count
to track when it is in NMI context. Other parts of the kernel can
use this to determine if the context is in NMI context or not.

This code was inspired by the -rt patch in_nmi version that was
written by Peter Zijlstra, who borrowed that code from
Mathieu Desnoyers.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>