From 665aa75700edda07bd7f05acab86cef1a1a1ea66 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Sun, 21 Feb 2016 23:22:35 +0900 Subject: [PATCH] perf tools: Fix segfault on dynamic entries A dynamic entry is created for each tracepoint event. When it sets up the sort key, it checks with existing keys using ->equal() callback. But it missed to set the ->equal for dynamic entries. The following segfault was due to the missing ->equal() callback. (gdb) bt #0 0x0000000000140003 in ?? () #1 0x0000000000537769 in fmt_equal (b=0x2106980, a=0x21067a0) at ui/hist.c:548 #2 perf_hpp__setup_output_field (list=0x8c6d80 ) at ui/hist.c:560 #3 0x00000000004e927e in setup_sorting (evlist=) at util/sort.c:2642 #4 0x000000000043cf50 in cmd_report (argc=, argv=, prefix=) at builtin-report.c:932 #5 0x00000000004865a1 in run_builtin (p=p@entry=0x8bbce0 , argc=argc@entry=7, argv=argv@entry=0x7ffd24d56ce0) at perf.c:390 #6 0x000000000042dc1f in handle_internal_command (argv=0x7ffd24d56ce0, argc=7) at perf.c:451 #7 run_argv (argv=0x7ffd24d56a70, argcp=0x7ffd24d56a7c) at perf.c:495 #8 main (argc=7, argv=0x7ffd24d56ce0) at perf.c:620 Signed-off-by: Namhyung Kim Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Andi Kleen Cc: David Ahern Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1456064558-13086-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/sort.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c index de71575..7daea71 100644 --- a/tools/perf/util/sort.c +++ b/tools/perf/util/sort.c @@ -1835,6 +1835,20 @@ bool perf_hpp__is_dynamic_entry(struct perf_hpp_fmt *fmt) return fmt->cmp == __sort__hde_cmp; } +static bool __sort__hde_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b) +{ + struct hpp_dynamic_entry *hde_a; + struct hpp_dynamic_entry *hde_b; + + if (!perf_hpp__is_dynamic_entry(a) || !perf_hpp__is_dynamic_entry(b)) + return false; + + hde_a = container_of(a, struct hpp_dynamic_entry, hpp); + hde_b = container_of(b, struct hpp_dynamic_entry, hpp); + + return hde_a->field == hde_b->field; +} + static void hde_free(struct perf_hpp_fmt *fmt) { struct hpp_dynamic_entry *hde; @@ -1867,6 +1881,7 @@ __alloc_dynamic_entry(struct perf_evsel *evsel, struct format_field *field) hde->hpp.cmp = __sort__hde_cmp; hde->hpp.collapse = __sort__hde_cmp; hde->hpp.sort = __sort__hde_cmp; + hde->hpp.equal = __sort__hde_equal; hde->hpp.free = hde_free; INIT_LIST_HEAD(&hde->hpp.list); -- 2.7.4