tools: Adopt __noreturn from kernel sources

To have a more compact way to specify that a function doesn't return,
instead of the open coded:

	__attribute__((noreturn))

And use it instead of the tools/perf/ specific variation, NORETURN.

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: http://lkml.kernel.org/n/tip-l0y144qzixcy5t4c6i7pdiqj@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/include/linux/compiler-gcc.h

@@ -19,3 +19,5 @@
 
 /* &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]))
+
+#define __noreturn	__attribute__((noreturn))

tools/perf/util/scripting-engines/trace-event-python.c

@@ -28,6 +28,7 @@
 #include <stdbool.h>
 #include <errno.h>
 #include <linux/bitmap.h>
+#include <linux/compiler.h>
 #include <linux/time64.h>
 
 #include "../../perf.h"
@@ -84,7 +85,7 @@ struct tables {
 
 static struct tables tables_global;
 
-static void handler_call_die(const char *handler_name) NORETURN;
+static void handler_call_die(const char *handler_name) __noreturn;
 static void handler_call_die(const char *handler_name)
 {
 	PyErr_Print();

tools/perf/util/usage.c

@@ -16,13 +16,13 @@ static void report(const char *prefix, const char *err, va_list params)
 	fprintf(stderr, " %s%s\n", prefix, msg);
 }
 
-static NORETURN void usage_builtin(const char *err)
+static __noreturn void usage_builtin(const char *err)
 {
 	fprintf(stderr, "\n Usage: %s\n", err);
 	exit(129);
 }
 
-static NORETURN void die_builtin(const char *err, va_list params)
+static __noreturn void die_builtin(const char *err, va_list params)
 {
 	report(" Fatal: ", err, params);
 	exit(128);
@@ -40,7 +40,7 @@ static void warn_builtin(const char *warn, va_list params)
 
 /* If we are in a dlopen()ed .so write to a global variable would segfault
  * (ugh), so keep things static. */
-static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
+static void (*usage_routine)(const char *err) __noreturn = usage_builtin;
 static void (*error_routine)(const char *err, va_list params) = error_builtin;
 static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
 

tools/perf/util/util.h

@@ -11,20 +11,18 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <linux/compiler.h>
 #include <linux/types.h>
 
-#ifdef __GNUC__
-#define NORETURN __attribute__((__noreturn__))
-#else
-#define NORETURN
+#ifndef __GNUC__
 #ifndef __attribute__
 #define __attribute__(x)
 #endif
 #endif
 
 /* General helper functions */
-void usage(const char *err) NORETURN;
-void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
+void usage(const char *err) __noreturn;
+void die(const char *err, ...) __noreturn __attribute__((format (printf, 1, 2)));
 int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));