tree 89f370c0079281c55f37230c17951514c1b508c9
parent 261842b7c9099f56de2eb969c8ad65402d68e00e
author Steven Rostedt <srostedt@redhat.com> 1239999235 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1239999695 -0400

tracing: protect trace_printk from recursion

trace_printk can be called from any context, including NMIs.
If this happens, then we must test for for recursion before
grabbing any spinlocks.

This patch prevents trace_printk from being called recursively.

[ Impact: prevent hard lockup in lockdep event tracer ]

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>