tools include compiler-gcc: Add __pure attribute helper

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message May 19, 2018

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2018-05-19 11:43 UTC #0 lore raw

Commit-ID:  6e1690c4c0b540930f08295b6a95c8660b257745
Gitweb:     https://git.kernel.org/tip/6e1690c4c0b540930f08295b6a95c8660b257745
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Thu, 17 May 2018 15:12:36 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
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 <[email protected]>

Cc David Ahern <[email protected]>

Cc Jiri Olsa <[email protected]>

Cc Namhyung Kim <[email protected]>

Cc Wang Nan <[email protected]>

Link https://lkml.kernel.org/n/[email protected] open here

Signed-off-by Arnaldo Carvalho de Melo <[email protected]>

---
 tools/include/linux/compiler-gcc.h | 3 +++
 1 file changed, 3 insertions(+)

tools/include/linux/compiler-gcc.h +3 -0

index a3a4427441bf..70fe61295733 100644
@@ -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))