linux-kernel - [RFC PATCH 7/9] perf: Support for error passed over pointers

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Date:	Wed, 13 Oct 2010 07:06:59 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>
Subject: [RFC PATCH 7/9] perf: Support for error passed over pointers

Export the linux/err.h that carries the ERR_PTR/PTR_ERR/IS_ERR
macros so that they also become usable by perf.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Tom Zanussi <tzanussi@...il.com>
Cc: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Robert Richter <robert.richter@....com>
---
 tools/perf/Makefile                 |    1 +
 tools/perf/util/include/linux/err.h |   24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 0 deletions(-)
 create mode 100644 tools/perf/util/include/linux/err.h

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 28de60b..1146195 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -375,6 +375,7 @@ LIB_H += util/include/linux/prefetch.h
 LIB_H += util/include/linux/rbtree.h
 LIB_H += util/include/linux/string.h
 LIB_H += util/include/linux/types.h
+LIB_H += util/include/linux/err.h
 LIB_H += util/include/asm/asm-offsets.h
 LIB_H += util/include/asm/bug.h
 LIB_H += util/include/asm/byteorder.h
diff --git a/tools/perf/util/include/linux/err.h b/tools/perf/util/include/linux/err.h
new file mode 100644
index 0000000..4e6dc36
--- /dev/null
+++ b/tools/perf/util/include/linux/err.h
@@ -0,0 +1,24 @@
+#ifndef PERF_ERR_H
+#define PERF_ERR_H
+
+
+#define MAX_ERRNO	4095
+
+#define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
+
+static inline void *ERR_PTR(long err)
+{
+	return (void *) err;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+	return (long) ptr;
+}
+
+static inline long IS_ERR(const void *ptr)
+{
+	return IS_ERR_VALUE((unsigned long)ptr);
+}
+
+#endif /* PERF_ERR_H */
-- 
1.6.2.3

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