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Date: Fri, 22 Mar 2019 15:26:05 -0700 From: tip-bot for Changbin Du <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: namhyung@...nel.org, daniel@...earbox.net, hpa@...or.com, jolsa@...nel.org, acme@...hat.com, changbin.du@...il.com, rostedt@...dmis.org, ast@...nel.org, mingo@...nel.org, tglx@...utronix.de, peterz@...radead.org, linux-kernel@...r.kernel.org Subject: [tip:perf/urgent] perf tools: Fix errors under optimization level '-Og' Commit-ID: 11c1ea6f1a9bc97bf857fd12f72eacb6c69794e2 Gitweb: https://git.kernel.org/tip/11c1ea6f1a9bc97bf857fd12f72eacb6c69794e2 Author: Changbin Du <changbin.du@...il.com> AuthorDate: Sat, 16 Mar 2019 16:05:43 +0800 Committer: Arnaldo Carvalho de Melo <acme@...hat.com> CommitDate: Tue, 19 Mar 2019 16:52:04 -0300 perf tools: Fix errors under optimization level '-Og' Optimization level '-Og' offers a reasonable level of optimization while maintaining fast compilation and a good debugging experience. This patch tries to make it work. $ make DEBUG=1 EXTRA_CFLAGS='-Og' bench/epoll-ctl.c: In function ‘do_threads’: bench/epoll-ctl.c:274:9: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized] return ret; ^~~ ... Signed-off-by: Changbin Du <changbin.du@...il.com> Reviewed-by: Jiri Olsa <jolsa@...nel.org> Cc: Alexei Starovoitov <ast@...nel.org> Cc: Daniel Borkmann <daniel@...earbox.net> Cc: Namhyung Kim <namhyung@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt (VMware) <rostedt@...dmis.org> Link: http://lkml.kernel.org/r/20190316080556.3075-4-changbin.du@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com> --- tools/lib/bpf/libbpf.c | 2 +- tools/perf/bench/epoll-ctl.c | 2 +- tools/perf/bench/epoll-wait.c | 2 +- tools/perf/tests/backward-ring-buffer.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index f5eb60379c8d..4884557aa17f 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -622,7 +622,7 @@ bpf_object__init_maps(struct bpf_object *obj, int flags) bool strict = !(flags & MAPS_RELAX_COMPAT); int i, map_idx, map_def_sz, nr_maps = 0; Elf_Scn *scn; - Elf_Data *data; + Elf_Data *data = NULL; Elf_Data *symbols = obj->efile.symbols; if (obj->efile.maps_shndx < 0) diff --git a/tools/perf/bench/epoll-ctl.c b/tools/perf/bench/epoll-ctl.c index 0c0a6e824934..2af067859966 100644 --- a/tools/perf/bench/epoll-ctl.c +++ b/tools/perf/bench/epoll-ctl.c @@ -224,7 +224,7 @@ static int do_threads(struct worker *worker, struct cpu_map *cpu) pthread_attr_t thread_attr, *attrp = NULL; cpu_set_t cpuset; unsigned int i, j; - int ret; + int ret = 0; if (!noaffinity) pthread_attr_init(&thread_attr); diff --git a/tools/perf/bench/epoll-wait.c b/tools/perf/bench/epoll-wait.c index 5a11534e96a0..fe85448abd45 100644 --- a/tools/perf/bench/epoll-wait.c +++ b/tools/perf/bench/epoll-wait.c @@ -293,7 +293,7 @@ static int do_threads(struct worker *worker, struct cpu_map *cpu) pthread_attr_t thread_attr, *attrp = NULL; cpu_set_t cpuset; unsigned int i, j; - int ret, events = EPOLLIN; + int ret = 0, events = EPOLLIN; if (oneshot) events |= EPOLLONESHOT; diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c index 6d598cc071ae..1a9c3becf5ff 100644 --- a/tools/perf/tests/backward-ring-buffer.c +++ b/tools/perf/tests/backward-ring-buffer.c @@ -18,7 +18,7 @@ static void testcase(void) int i; for (i = 0; i < NR_ITERS; i++) { - char proc_name[10]; + char proc_name[15]; snprintf(proc_name, sizeof(proc_name), "p:%d\n", i); prctl(PR_SET_NAME, proc_name);
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