linux-kernel - [tip:perf/core] kprobes: Move __kprobes definition into compiler.h

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Date:	Wed, 10 Apr 2013 02:21:40 -0700
From:	tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, xemul@...allels.com,
	jkosina@...e.cz, davem@...emloft.net, nyc@...omorphy.com,
	ananth@...ibm.com, masami.hiramatsu.pt@...achi.com,
	tglx@...utronix.de, timo.lindfors@....fi
Subject: [tip:perf/core] kprobes:
  Move __kprobes definition into compiler.h

Commit-ID:  324670b620ab1ed00ba160e435686bd2ae4a59ce
Gitweb:     http://git.kernel.org/tip/324670b620ab1ed00ba160e435686bd2ae4a59ce
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Thu, 4 Apr 2013 19:40:50 +0900
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 8 Apr 2013 17:28:34 +0200

kprobes: Move __kprobes definition into compiler.h

Currently, __kprobes is defined in linux/kprobes.h which
is too big to be included in small or basic headers
that want to make use of this simple attribute.

So move __kprobes definition into linux/compiler.h
in which other compiler attributes are defined.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Timo Juhani Lindfors <timo.lindfors@....fi>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Nadia Yvette Chambers <nyc@...omorphy.com>
Cc: yrl.pp-manager.tt@...achi.com
Cc: David S. Miller <davem@...emloft.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/20130404104049.21071.20908.stgit@mhiramat-M0-7522
[ Improved the attribute explanation a bit. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/compiler.h | 6 ++++++
 include/linux/kprobes.h  | 6 +-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 10b8f23..92669cd 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -351,4 +351,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
  */
 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
 
+/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */
+#ifdef CONFIG_KPROBES
+# define __kprobes	__attribute__((__section__(".kprobes.text")))
+#else
+# define __kprobes
+#endif
 #endif /* __LINUX_COMPILER_H */
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 4b6ef4d..ca1d27a 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -29,6 +29,7 @@
  *		<jkenisto@...ibm.com>  and Prasanna S Panchamukhi
  *		<prasanna@...ibm.com> added function-return probes.
  */
+#include <linux/compiler.h>	/* for __kprobes */
 #include <linux/linkage.h>
 #include <linux/list.h>
 #include <linux/notifier.h>
@@ -49,16 +50,11 @@
 #define KPROBE_REENTER		0x00000004
 #define KPROBE_HIT_SSDONE	0x00000008
 
-/* Attach to insert probes on any functions which should be ignored*/
-#define __kprobes	__attribute__((__section__(".kprobes.text")))
-
 #else /* CONFIG_KPROBES */
 typedef int kprobe_opcode_t;
 struct arch_specific_insn {
 	int dummy;
 };
-#define __kprobes
-
 #endif /* CONFIG_KPROBES */
 
 struct kprobe;
--
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