linux-kernel - [PATCH 03/28] tools include: Introduce linux/bug.h, from the kernel sources

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Date:   Wed, 19 Apr 2017 13:16:58 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 03/28] tools include: Introduce linux/bug.h, from the kernel sources

From: Arnaldo Carvalho de Melo <acme@...hat.com>

With just what we will need in the upcoming changesets, the
BUILD_BUG_ON_ZERO() definition.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-lw8zg7x6ttwcvqhp90mwe3vo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/include/linux/bug.h | 10 ++++++++++
 tools/perf/MANIFEST       |  1 +
 2 files changed, 11 insertions(+)
 create mode 100644 tools/include/linux/bug.h

diff --git a/tools/include/linux/bug.h b/tools/include/linux/bug.h
new file mode 100644
index 000000000000..8e4a4f49135d
--- /dev/null
+++ b/tools/include/linux/bug.h
@@ -0,0 +1,10 @@
+#ifndef _TOOLS_PERF_LINUX_BUG_H
+#define _TOOLS_PERF_LINUX_BUG_H
+
+/* Force a compilation error if condition is true, but also produce a
+   result (of value 0 and type size_t), so the expression can be used
+   e.g. in a structure initializer (or where-ever else comma expressions
+   aren't permitted). */
+#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
+
+#endif	/* _TOOLS_PERF_LINUX_BUG_H */
diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST
index 89018c7311a4..a29da46d180f 100644
--- a/tools/perf/MANIFEST
+++ b/tools/perf/MANIFEST
@@ -64,6 +64,7 @@ tools/include/linux/bitops.h
 tools/include/linux/compiler.h
 tools/include/linux/compiler-gcc.h
 tools/include/linux/coresight-pmu.h
+tools/include/linux/bug.h
 tools/include/linux/filter.h
 tools/include/linux/hash.h
 tools/include/linux/kernel.h
-- 
2.9.3