linux-kernel - [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute

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Message-Id: <1422276894-31302-3-git-send-email-heiko.carstens@de.ibm.com>
Date:	Mon, 26 Jan 2015 13:54:53 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <maasami.hiramatsu.pt@...achi.com>
Cc:	Vojtech Pavlik <vojtech@...e.cz>, Jiri Kosina <jkosina@...e.cz>,
	Jiri Slaby <jslaby@...e.cz>,
	Andreas Krebbel <krebbel@...ux.vnet.ibm.com>,
	Dominik Vogt <vogt@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [PATCH/RFC 2/3] ftrace: introduce nohotpatch function attribute

gcc supports an s390 specific function attribute called "hotpatch".
It can be used to specify the number of halfwords that shall be added before
and after a function that shall be filled with nops for runtime patching.

s390 will use the hotpatch attribute for function tracing, therefore
introduce a nohotpatch define, depending on CC_USING_HOTPATCH, and add it
to the existing notrace define.

Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
 include/linux/compiler.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index b4fd7013c9f4..b4ab98e0e10b 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -54,7 +54,13 @@ extern void __chk_io_ptr(const volatile void __iomem *);
 #include <linux/compiler-gcc.h>
 #endif
 
-#define notrace __attribute__((no_instrument_function))
+#ifdef CC_USING_HOTPATCH
+#define nohotpatch __attribute__((hotpatch(0,0)))
+#else
+#define nohotpatch
+#endif
+
+#define notrace __attribute__((no_instrument_function)) nohotpatch
 
 /* Intel compiler defines __GNUC__. So we will overwrite implementations
  * coming from above header files here
-- 
2.1.4

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