Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Various fixlets:

  On the kernel side:

   - fix a race
   - fix a bug in the handling of the perf ring-buffer data page

  On the tooling side:

   - fix the handling of certain corrupted perf.data files
   - fix a bug in 'perf probe'
   - fix a bug in 'perf record + perf sched'
   - fix a bug in 'make install'
   - fix a bug in libaudit feature-detection on certain distros"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf session: Fix infinite loop on invalid perf.data file
  perf tools: Fix installation of libexec components
  perf probe: Fix to find line information for probe list
  perf tools: Fix libaudit test
  perf stat: Set child_pid after perf_evlist__prepare_workload()
  perf tools: Add default handler for mmap2 events
  perf/x86: Clean up cap_user_time* setting
  perf: Fix perf_pmu_migrate_context

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ce69901176d8..c3e5a3b817ab 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2768,6 +2768,18 @@ int perf_session__read_header(struct perf_session *session)
         if (perf_file_header__read(&f_header, header, fd) < 0)
                 return -EINVAL;
 
+        /*
+         * Sanity check that perf.data was written cleanly; data size is
+         * initialized to 0 and updated only if the on_exit function is run.
+         * If data size is still 0 then the file contains only partial
+         * information.  Just warn user and process it as much as it can.
+         */
+        if (f_header.data.size == 0) {
+                pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
+                           "Was the 'perf record' command properly terminated?\n",
+                           session->filename);
+        }
+
         nr_attrs = f_header.attrs.size / f_header.attr_size;
         lseek(fd, f_header.attrs.offset, SEEK_SET);