[PATCH] perf tools:Fix perf_bench to show proper convergence

[Srikar Dronamraju]

With commit: e1e455f (perf tools: Work around lack of sched_getcpu in
glibc < 2.6), perf_bench numa mem with -c or -m option is not able to
correctly calculate convergence. With the above commit, sched_getcpu
always seems to return -1. The intention of commit e1e455f was to add a
sched_getcpu in glibc < 2.6. Hence keep the sched_getcpu definition
under an ifdef.

This regression happened occurred between v4.0 and v4.1

Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
 tools/perf/util/cloexec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c
index 85b5238..2babdda 100644
--- a/tools/perf/util/cloexec.c
+++ b/tools/perf/util/cloexec.c
@@ -7,11 +7,15 @@
 
 static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
 
+#ifdef __GLIBC_PREREQ
+#if !__GLIBC_PREREQ(2, 6)
 int __weak sched_getcpu(void)
 {
 	errno = ENOSYS;
 	return -1;
 }
+#endif
+#endif
 
 static int perf_flag_probe(void)
 {
-- 
1.8.3.1

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