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| author |   Ian Rogers <irogers@google.com> | 2023-04-19 10:48:37 -0300 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-04-19 10:53:01 -0300 |
| commit | 8f12692b7e61e5fb5d3e4f6692d6675f62eeebdc (patch) | |
| tree | c3c653ed2524b984c7b4ae279d6a096f344fd569 /tools/perf/util/unwind-libdw.c | |
| parent | perf maps: Use maps__nr_maps() instead of open coded maps->nr_maps (diff) | |
| download | wireguard-linux-8f12692b7e61e5fb5d3e4f6692d6675f62eeebdc.tar.xz wireguard-linux-8f12692b7e61e5fb5d3e4f6692d6675f62eeebdc.zip | |
perf maps: Add reference count checking
Add reference count checking to make sure of good use of get and put.
Add and use accessors to reduce RC_CHK clutter.
The only significant issue was in tests/thread-maps-share.c where
reference counts were released in the reverse order to acquisition,
leading to a use after put. This was fixed by reversing the put order.
Committer notes:
Extracted from a larger patch removing bits that were covered by the use
of pre-existing maps__ accessors (e.g. maps__nr_maps()) and new ones
added (maps__refcnt()) to reduce RC_CHK_ACCESS(maps)-> source code
pollution.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Link: https://lore.kernel.org/lkml/20230407230405.2931830-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/unwind-libdw.c')
| -rw-r--r-- | tools/perf/util/unwind-libdw.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c index 9565f9906e5d..bdccfc511b7e 100644 --- a/tools/perf/util/unwind-libdw.c +++ b/tools/perf/util/unwind-libdw.c @@ -230,7 +230,7 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg, struct unwind_info *ui, ui_buf = { .sample = data, .thread = thread, - .machine = thread->maps->machine, + .machine = RC_CHK_ACCESS(thread->maps)->machine, .cb = cb, .arg = arg, .max_stack = max_stack, |