[PATCH 09/15] ftrace: Avoid recording mcount on .init sections directly

Steven Rostedt
2011-05-18T16:11:14Z

[-- Attachment #1: 0009-ftrace-Avoid-recording-mcount-on-.init-sections-dire.patch --]
[-- Type: text/plain, Size: 2370 bytes --]

From: Steven Rostedt <srostedt@redhat.com>

The init and exit sections should not be traced and adding a call to
mcount to them is a waste of text and instruction cache. Have the
macro section attributes include notrace to ignore these functions
for tracing from the build.

Link: http://lkml.kernel.org/r/20110421023738.953028219@goodmis.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
include/linux/init.h | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 577671c..9146f39 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -79,29 +79,29 @@
#define __exitused __used
#endif

-#define __exit __section(.exit.text) __exitused __cold
+#define __exit __section(.exit.text) __exitused __cold notrace

/* Used for HOTPLUG */
-#define __devinit __section(.devinit.text) __cold
+#define __devinit __section(.devinit.text) __cold notrace
#define __devinitdata __section(.devinit.data)
#define __devinitconst __section(.devinit.rodata)
-#define __devexit __section(.devexit.text) __exitused __cold
+#define __devexit __section(.devexit.text) __exitused __cold notrace
#define __devexitdata __section(.devexit.data)
#define __devexitconst __section(.devexit.rodata)

/* Used for HOTPLUG_CPU */
-#define __cpuinit __section(.cpuinit.text) __cold
+#define __cpuinit __section(.cpuinit.text) __cold notrace
#define __cpuinitdata __section(.cpuinit.data)
#define __cpuinitconst __section(.cpuinit.rodata)
-#define __cpuexit __section(.cpuexit.text) __exitused __cold
+#define __cpuexit __section(.cpuexit.text) __exitused __cold notrace
#define __cpuexitdata __section(.cpuexit.data)
#define __cpuexitconst __section(.cpuexit.rodata)

/* Used for MEMORY_HOTPLUG */
-#define __meminit __section(.meminit.text) __cold
+#define __meminit __section(.meminit.text) __cold notrace
#define __meminitdata __section(.meminit.data)
#define __meminitconst __section(.meminit.rodata)
-#define __memexit __section(.memexit.text) __exitused __cold
+#define __memexit __section(.memexit.text) __exitused __cold notrace
#define __memexitdata __section(.memexit.data)
#define __memexitconst __section(.memexit.rodata)

--
1.7.4.4