[tip:perf/core] tools include compiler-gcc: Add __pure attribute helper

tip-bot for Arnaldo Carvalho de Melo
2018-05-19T11:43:54Z

Commit-ID: 6e1690c4c0b540930f08295b6a95c8660b257745
Gitweb: https://git.kernel.org/tip/6e1690c4c0b540930f08295b6a95c8660b257745
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Thu, 17 May 2018 15:12:36 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 17 May 2018 15:17:21 -0300

tools include compiler-gcc: Add __pure attribute helper

Adopt it from the kernel sources, will be used soon.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-oubheiqj8edo5rzewt11cbn0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/include/linux/compiler-gcc.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index a3a4427441bf..70fe61295733 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -21,6 +21,9 @@
/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))

+#ifndef __pure
+#define __pure __attribute__((pure))
+#endif
#define noinline __attribute__((noinline))
#ifndef __packed
#define __packed __attribute__((packed))