From: Andrew Morton <akpm@linux-foundation.org>
Date: Sat, 7 Nov 2015 00:30:09 +0000 (-0800)
Subject: include/linux/compiler-gcc.h: improve __visible documentation
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=9add850c211a39d5ab1a091d48795e21599a73d0;p=deliverable%2Flinux.git

include/linux/compiler-gcc.h: improve __visible documentation

Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 0e3110a0b771..22ab246feed3 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -205,7 +205,10 @@
 
 #if GCC_VERSION >= 40600
 /*
- * Tell the optimizer that something else uses this function or variable.
+ * When used with Link Time Optimization, gcc can optimize away C functions or
+ * variables which are referenced only from assembly code.  __visible tells the
+ * optimizer that something else uses this function or variable, thus preventing
+ * this.
  */
 #define __visible	__attribute__((externally_visible))
 #endif