[PATCH v3 3/6] tools: add __used and enable to override

This adds __used, to be used later in the userspace linker-tables
sandbox. If any userspace applicaiton wants to override they can
add their own definition and then use include_next.

This definition should probably suffice for most uses cases though.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 tools/include/linux/compiler.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index e33fc1df3935..556c991de212 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h

@@ -5,6 +5,12 @@
 /* The "volatile" is due to gcc bugs */
 #define barrier() __asm__ __volatile__("": : :"memory")
 
+
+/* You can override as you see fit on your userspace tool */
+#ifndef __used
+#define __used          __attribute__((__used__))
+#endif
+
 #ifndef __always_inline
 # define __always_inline	inline __attribute__((always_inline))
 #endif

-- 
2.11.0