From a9b608b7bbfe25c1321b3b4dfa45338f91c4c043 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 11 Oct 2017 16:01:22 +0200 Subject: backports: add OPTIMIZER_HIDE_VAR Signed-off-by: Johannes Berg --- backport/backport-include/linux/compiler-gccN.h | 4 ++++ backport/backport-include/linux/compiler.h | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/backport/backport-include/linux/compiler-gccN.h b/backport/backport-include/linux/compiler-gccN.h index 23ad803d..97e7541d 100644 --- a/backport/backport-include/linux/compiler-gccN.h +++ b/backport/backport-include/linux/compiler-gccN.h @@ -120,3 +120,7 @@ #endif #endif /* gcc version >= 40000 specific checks */ + +#ifndef OPTIMIZER_HIDE_VAR +#define OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "=r" (var) : "0" (var)) +#endif diff --git a/backport/backport-include/linux/compiler.h b/backport/backport-include/linux/compiler.h index e5af565b..53c069df 100644 --- a/backport/backport-include/linux/compiler.h +++ b/backport/backport-include/linux/compiler.h @@ -88,4 +88,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s }) #endif +#ifndef OPTIMIZER_HIDE_VAR +#define OPTIMIZER_HIDE_VAR(var) barrier() +#endif + #endif /* __BACKPORT_LINUX_COMPILER_H */ -- cgit v1.2.3