Using linux-3.18.y branch, perf build fails with the following:

    $ make -s -j16 -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1 
HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1 
prefix=/usr DESTDIR=/tmp/builddir/build all
    [...]
    util/session.c: In function ‘__perf_session__process_pipe_events’:
    util/session.c:1093:36: error: ‘oe’ undeclared (first use in this function)
      ordered_events__set_copy_on_queue(oe, true);
                                        ^
    util/session.c:1093:36: note: each undeclared identifier is reported only 
once for each function it appears in

This patch fixes it for linux-3.18.y branch.

Fixes: 95b33b99cdd6 ("perf inject: Copy events when reordering events in pipe 
mode")
Cc: <sta...@vger.kernel.org> # 3.18.x
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: David Carrillo-Cisneros <davi...@google.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: He Kuang <heku...@huawei.com>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Masami Hiramatsu <mhira...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Paul Turner <p...@google.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Sasha Levin <alexander.le...@microsoft.com>
Cc: Simon Que <s...@chromium.org>
Cc: Stephane Eranian <eran...@google.com>
Cc: Wang Nan <wangn...@huawei.com>
Signed-off-by: Murilo Opsfelder Araujo <muri...@linux.ibm.com>
---
 tools/perf/util/session.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index dc3d3b1b813e..c2d4a7ec40df 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1073,6 +1073,7 @@ volatile int session_done;
 static int __perf_session__process_pipe_events(struct perf_session *session,
                                               struct perf_tool *tool)
 {
+       struct ordered_events *oe = &session->ordered_events;
        int fd = perf_data_file__fd(session->file);
        union perf_event *event;
        uint32_t size, cur_size = 0;
-- 
2.14.3

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