[PATCH 4/5] ftrace: do not trace nmi callers in kernel directory

[Steven Rostedt <rostedt@goodmis.org>]

[-- Attachment #1: ftrace-no-trace-nmi-kernel.patch --]
[-- Type: text/plain, Size: 1382 bytes --]

The dynamic ftrace code performs run time modification of the code text
section. This is not safe to do unless all other CPUS are halted. Because
there is no good way to halt NMIs while doing the modification, we must
make sure that the NMIs will not execute code that will be modified.

This patch adds notrace annotation to functions called by NMIs in the
kernel directory.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
 kernel/Makefile |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-tip.git/kernel/Makefile
===================================================================
--- linux-tip.git.orig/kernel/Makefile	2008-07-29 20:13:14.000000000 -0400
+++ linux-tip.git/kernel/Makefile	2008-07-29 20:33:51.000000000 -0400
@@ -15,6 +15,8 @@ CFLAGS_REMOVE_sched.o = -mno-spe
 
 ifdef CONFIG_FTRACE
 # Do not trace debug files and internal ftrace files
+CFLAGS_REMOVE_kprobes.o = -pg
+CFLAGS_REMOVE_test_kprobes.o = -pg
 CFLAGS_REMOVE_lockdep.o = -pg
 CFLAGS_REMOVE_lockdep_proc.o = -pg
 CFLAGS_REMOVE_mutex-debug.o = -pg
@@ -22,6 +24,11 @@ CFLAGS_REMOVE_rtmutex-debug.o = -pg
 CFLAGS_REMOVE_cgroup-debug.o = -pg
 CFLAGS_REMOVE_sched_clock.o = -pg
 CFLAGS_REMOVE_sched.o = -mno-spe -pg
+ifdef CONFIG_DYNAMIC_FTRACE
+# NMI called files
+CFLAGS_REMOVE_notifier.o = -pg
+CFLAGS_REMOVE_spinlock.o = -pg
+endif
 endif
 
 obj-$(CONFIG_PROFILING) += profile.o

--