Patch "perf tools: Work around lack of sched_getcpu in glibc < 2.6." has been added to the 3.19-stable tree

Patch "perf tools: Work around lack of sched_getcpu in glibc < 2.6." has been added to the 3.19-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    perf tools: Work around lack of sched_getcpu in glibc < 2.6.

to the 3.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-tools-work-around-lack-of-sched_getcpu-in-glibc-2.6.patch
and it can be found in the queue-3.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e1e455f4f4d35850c30235747620d0d078fe9f64 Mon Sep 17 00:00:00 2001
From: Vinson Lee <vlee@twitter.com>
Date: Mon, 23 Mar 2015 12:09:16 -0700
Subject: perf tools: Work around lack of sched_getcpu in glibc < 2.6.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Vinson Lee <vlee@twitter.com>

commit e1e455f4f4d35850c30235747620d0d078fe9f64 upstream.

This patch fixes this build error with glibc < 2.6.

  CC       util/cloexec.o
cc1: warnings being treated as errors
util/cloexec.c: In function ‘perf_flag_probe’:
util/cloexec.c:24: error: implicit declaration of function
‘sched_getcpu’
util/cloexec.c:24: error: nested extern declaration of ‘sched_getcpu’
make: *** [util/cloexec.o] Error 1

Signed-off-by: Vinson Lee <vlee@twitter.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Link: http://lkml.kernel.org/r/1427137761-16119-1-git-send-email-vlee@twopensource.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/perf/util/cloexec.c |    6 ++++++
 tools/perf/util/cloexec.h |    6 ++++++
 2 files changed, 12 insertions(+)

--- a/tools/perf/util/cloexec.c
+++ b/tools/perf/util/cloexec.c
@@ -7,6 +7,12 @@
 
 static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
 
+int __weak sched_getcpu(void)
+{
+	errno = ENOSYS;
+	return -1;
+}
+
 static int perf_flag_probe(void)
 {
 	/* use 'safest' configuration as used in perf_evsel__fallback() */
--- a/tools/perf/util/cloexec.h
+++ b/tools/perf/util/cloexec.h
@@ -3,4 +3,10 @@
 
 unsigned long perf_event_open_cloexec_flag(void);
 
+#ifdef __GLIBC_PREREQ
+#if !__GLIBC_PREREQ(2, 6)
+extern int sched_getcpu(void) __THROW;
+#endif
+#endif
+
 #endif /* __PERF_CLOEXEC_H */


Patches currently in stable-queue which might be from vlee@twitter.com are

queue-3.19/perf-tools-work-around-lack-of-sched_getcpu-in-glibc-2.6.patch
queue-3.19/perf-symbols-define-stt_gnu_ifunc-for-glibc-2.9-and-older.patch