linux-kernel - [06/19] tracing: add notrace to linkage.h

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Message-ID: <20080210072018.GG4100@elte.hu>
Date:	Sun, 10 Feb 2008 08:20:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@....com.au>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [06/19] tracing: add notrace to linkage.h

From: Ingo Molnar <mingo@...e.hu>

notrace signals that a function should not be traced. Most of the
time this is used by tracers to annotate code that cannot be
traced - it's in a volatile state (such as in user vdso context
or NMI context) or it's in the tracer internals.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/linkage.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/include/linux/linkage.h
===================================================================
--- linux.orig/include/linux/linkage.h
+++ linux/include/linux/linkage.h
@@ -3,6 +3,8 @@
 
 #include <asm/linkage.h>
 
+#define notrace __attribute__((no_instrument_function))
+
 #ifdef __cplusplus
 #define CPP_ASMLINKAGE extern "C"
 #else
--
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