[PATCH v10 37/38] compiler-gcc.h: Introduce __nostackp function attribute

[Tom Lendacky]

Create a new function attribute, __nostackp, that can used to turn off
stack protection on a per function basis.

Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
---
 include/linux/compiler-gcc.h | 2 ++
 include/linux/compiler.h     | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index cd4bbe8..682063b 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -166,6 +166,8 @@
 
 #if GCC_VERSION >= 40100
 # define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
+
+#define __nostackp	__attribute__((__optimize__("no-stack-protector")))
 #endif
 
 #if GCC_VERSION >= 40300
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 219f82f..63cbca1 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -470,6 +470,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
 #define __visible
 #endif
 
+#ifndef __nostackp
+#define __nostackp
+#endif
+
 /*
  * Assume alignment of return value.
  */
-- 
1.9.1