Revert "perf tools: Fix jump label always changing during tracing"

This reverts commit deaff8b659cf4d34181c087b8cdf74f1eb17b02b.

This commit makes CLOEXEC feature undetected for normal users,
because per-cpu events are priviledged.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20140728065844.GK6758@twins.programming.kicks-ass.net
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c
index 6a37be5..c5d05ec 100644 (file)
--- a/tools/perf/util/cloexec.c
+++ b/tools/perf/util/cloexec.c
@@ -1,4 +1,3 @@
-#include <sched.h>
 #include "util.h"
 #include "../perf.h"
 #include "cloexec.h"
@@ -15,13 +14,9 @@ static int perf_flag_probe(void)
        };
        int fd;
        int err;
-       int cpu = sched_getcpu();
-
-       if (cpu < 0)
-               cpu = 0;
 
        /* check cloexec flag */
-       fd = sys_perf_event_open(&attr, -1, cpu, -1,
+       fd = sys_perf_event_open(&attr, 0, -1, -1,
                                 PERF_FLAG_FD_CLOEXEC);
        err = errno;
 
@@ -35,7 +30,7 @@ static int perf_flag_probe(void)
                  err, strerror(err));
 
        /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
-       fd = sys_perf_event_open(&attr, -1, cpu, -1, 0);
+       fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
        err = errno;
 
        if (WARN_ONCE(fd < 0,