X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Flinux%2Fcompiler-gcc.h;h=02ae99e8e6d38a49ba59e76ecb722fce64376a51;hb=981250553d7fa27a1430a521d6f68b5eb7657f2a;hp=24545cd90a252b8dea0a9eec462b97a03b86adaa;hpb=521e2e03b8f6c92910b72fd464126596242398f8;p=firefly-linux-kernel-4.4.55.git

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 24545cd90a25..02ae99e8e6d3 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -37,6 +37,9 @@
     __asm__ ("" : "=r"(__ptr) : "0"(ptr));		\
     (typeof(ptr)) (__ptr + (off)); })
 
+/* Make the optimizer believe the variable can be manipulated arbitrarily. */
+#define OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "=r" (var) : "0" (var))
+
 #ifdef __CHECKER__
 #define __must_be_array(arr) 0
 #else