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From 6d97e1b1c2434fb769be7a72813efd11925225a9 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Sun, 6 Jun 2010 03:28:43 +0200
Subject: [PATCH 03/22] add noinline and noclone attributes to naked functions
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
include/linux/compiler-gcc.h | 11 ++++++++++-
include/linux/compiler-gcc4.h | 2 ++
2 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index a3ed7cb..132a651 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -58,8 +58,12 @@
* naked functions because then mcount is called without stack and frame pointer
* being set up and there is no chance to restore the lr register to the value
* before mcount was called.
+ *
+ * The asm() bodies of naked functions often depend on standard calling conventions,
+ * therefore they must be noinline and noclone. GCC 4.[56] currently fail to enforce
+ * this, so we must do so ourselves. See GCC PR44290.
*/
-#define __naked __attribute__((naked)) notrace
+#define __naked __attribute__((naked)) noinline __noclone notrace
#define __noreturn __attribute__((noreturn))
@@ -84,3 +88,8 @@
#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)
#define gcc_header(x) _gcc_header(x)
#include gcc_header(__GNUC__)
+
+#if !defined(__noclone)
+#define __noclone /* not needed */
+#endif
+
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index 450fa59..cd5932a 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -36,4 +36,6 @@
the kernel context */
#define __cold __attribute__((__cold__))
+/* Mark a function definition as prohibited from being cloned. */
+#define __noclone __attribute__((__noclone__))
#endif
--
1.7.1.1
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