[tip:perf/core] perf tools: Move barrier() definition to tools/ include/linux/compiler.h

From: tip-bot for Arnaldo Carvalho de Melo
Date: Sun May 10 2015 - 03:07:02 EST

Commit-ID: 5ac69737dc5e25fb1c26d18059c8e17ce2671d5d
Gitweb: http://git.kernel.org/tip/5ac69737dc5e25fb1c26d18059c8e17ce2671d5d
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 7 May 2015 13:38:16 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 8 May 2015 16:05:04 -0300

perf tools: Move barrier() definition to tools/include/linux/compiler.h

To make it generally accessible by other tools/ projects, also will be
used in the tools/arch/*/include/asm/barrier.h files that are being
introduced now.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-qnjdqwu3vcnt14vqmr6wu788@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/include/linux/compiler.h | 4 ++++
tools/perf/perf-sys.h | 2 --
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index 88461f0..f0e7267 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -1,6 +1,10 @@

+/* Optimization barrier */
+/* The "volatile" is due to gcc bugs */
+#define barrier() __asm__ __volatile__("": : :"memory")
#ifndef __always_inline
# define __always_inline inline __attribute__((always_inline))
diff --git a/tools/perf/perf-sys.h b/tools/perf/perf-sys.h
index bf349ea..f44e53e 100644
--- a/tools/perf/perf-sys.h
+++ b/tools/perf/perf-sys.h
@@ -153,8 +153,6 @@
#define CPUINFO_PROC {"model name"}

-#define barrier() asm volatile ("" ::: "memory")
#ifndef cpu_relax
#define cpu_relax() barrier()
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