From 4562a7393996bb28bf629277903a561bfefea177 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Sun, 21 Jul 2019 13:24:25 +0200 Subject: [PATCH] libperf: Add perf_evlist__init() function Add the perf_evlist__init() function to initialize a perf_evlist struct. Committer testing: Fix a change in init ordering that was causing this backtrace: (gdb) run stat sleep 1 Starting program: /root/bin/perf stat sleep 1 Program received signal SIGSEGV, Segmentation fault. 0x00000000004f6b55 in __perf_evlist__propagate_maps (evlist=0xbb34c0, evsel=0x0) at util/evlist.c:161 161 if (!evsel->own_cpus || evlist->has_user_cpus) { Missing separate debuginfos, use: dnf debuginfo-install bzip2-libs-1.0.6-29.fc30.x86_64 elfutils-libelf-0.176-3.fc30.x86_64 elfutils-libs-0.176-3.fc30.x86_64 glib2-2.60.4-1.fc30.x86_64 libbabeltrace-1.5.6-2.fc30.x86_64 libgcc-9.1.1-1.fc30.x86_64 libunwind-1.3.1-2.fc30.x86_64 libuuid-2.33.2-1.fc30.x86_64 libxcrypt-4.4.6-2.fc30.x86_64 libzstd-1.4.0-1.fc30.x86_64 numactl-libs-2.0.12-2.fc30.x86_64 pcre-8.43-2.fc30.x86_64 perl-libs-5.28.2-436.fc30.x86_64 popt-1.16-17.fc30.x86_64 python2-libs-2.7.16-2.fc30.x86_64 slang-2.3.2-5.fc30.x86_64 xz-libs-5.2.4-5.fc30.x86_64 zlib-1.2.11-15.fc30.x86_64 (gdb) bt #0 0x00000000004f6b55 in __perf_evlist__propagate_maps (evlist=0xbb34c0, evsel=0x0) at util/evlist.c:161 #1 0x00000000004f6c7a in perf_evlist__propagate_maps (evlist=0xbb34c0) at util/evlist.c:178 #2 0x00000000004f955e in perf_evlist__set_maps (evlist=0xbb34c0, cpus=0x0, threads=0x0) at util/evlist.c:1128 #3 0x00000000004f66f8 in evlist__init (evlist=0xbb34c0, cpus=0x0, threads=0x0) at util/evlist.c:52 #4 0x00000000004f6790 in evlist__new () at util/evlist.c:64 #5 0x0000000000456071 in cmd_stat (argc=3, argv=0x7fffffffd670) at builtin-stat.c:1705 #6 0x00000000004dd0fa in run_builtin (p=0xa21e00 , argc=3, argv=0x7fffffffd670) at perf.c:304 #7 0x00000000004dd367 in handle_internal_command (argc=3, argv=0x7fffffffd670) at perf.c:356 #8 0x00000000004dd4ae in run_argv (argcp=0x7fffffffd4cc, argv=0x7fffffffd4c0) at perf.c:400 #9 0x00000000004dd81a in main (argc=3, argv=0x7fffffffd670) at perf.c:522 (gdb) bt So move the initialization of the core evlist (calling perf_evlist__init()) to before perf_evlist__set_maps() in evlist__init(). Signed-off-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Alexey Budankov Cc: Andi Kleen Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190721112506.12306-39-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/lib/evlist.c | 5 +++++ tools/perf/lib/include/perf/evlist.h | 4 ++++ tools/perf/lib/libperf.map | 1 + tools/perf/util/evlist.c | 3 ++- 4 files changed, 12 insertions(+), 1 deletion(-) diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c index 646bdd518793..fdc8c1894b37 100644 --- a/tools/perf/lib/evlist.c +++ b/tools/perf/lib/evlist.c @@ -2,3 +2,8 @@ #include #include #include + +void perf_evlist__init(struct perf_evlist *evlist) +{ + INIT_LIST_HEAD(&evlist->entries); +} diff --git a/tools/perf/lib/include/perf/evlist.h b/tools/perf/lib/include/perf/evlist.h index 92b0eb39caec..1ddfcca0bd01 100644 --- a/tools/perf/lib/include/perf/evlist.h +++ b/tools/perf/lib/include/perf/evlist.h @@ -2,6 +2,10 @@ #ifndef __LIBPERF_EVLIST_H #define __LIBPERF_EVLIST_H +#include + struct perf_evlist; +LIBPERF_API void perf_evlist__init(struct perf_evlist *evlist); + #endif /* __LIBPERF_EVLIST_H */ diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map index 54f8503c6d82..5ca6ff6fcdfa 100644 --- a/tools/perf/lib/libperf.map +++ b/tools/perf/lib/libperf.map @@ -10,6 +10,7 @@ LIBPERF_0.0.1 { perf_thread_map__get; perf_thread_map__put; perf_evsel__init; + perf_evlist__init; local: *; }; diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index faf3ffd81d4c..f4aa6cf80559 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -33,6 +33,7 @@ #include #include #include +#include #ifdef LACKS_SIGQUEUE_PROTOTYPE int sigqueue(pid_t pid, int sig, const union sigval value); @@ -48,7 +49,7 @@ void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus, for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i) INIT_HLIST_HEAD(&evlist->heads[i]); - INIT_LIST_HEAD(&evlist->core.entries); + perf_evlist__init(&evlist->core); perf_evlist__set_maps(evlist, cpus, threads); fdarray__init(&evlist->pollfd, 64); evlist->workload.pid = -1; -- 2.30.2