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Message-ID: <aWGqdmr7BQPzhq-k@google.com>
Date: Fri, 9 Jan 2026 17:25:10 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Blake Jones <blakejones@...gle.com>,
Zhongqiu Han <quic_zhonhan@...cinc.com>,
Chun-Tse Shao <ctshao@...gle.com>,
"Dr. David Alan Gilbert" <linux@...blig.org>,
Stephen Brennan <stephen.s.brennan@...cle.com>,
Thomas Falcon <thomas.falcon@...el.com>,
Howard Chu <howardchu95@...il.com>, Yunseong Kim <ysk@...lloc.com>,
Leo Yan <leo.yan@....com>, Dmitry Vyukov <dvyukov@...gle.com>,
Haibo Xu <haibo1.xu@...el.com>,
Alexandre Ghiti <alexghiti@...osinc.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf: Switch printf("...%s", strerror(errno)) to
printf("...%m")
On Wed, Nov 19, 2025 at 03:36:21PM -0800, Ian Rogers wrote:
> strerror has thread safety issues, strerror_r requires stack allocated
> buffers. Code in perf has already been using the "%m" formatting flag
> that is a widely support glibc extension to print the current errno's
> description. Expand the usage of this formatting flag and remove usage
> of strerror/strerror_r.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Thanks,
Namhyung
> ---
> tools/perf/arch/x86/tests/bp-modify.c | 30 +++++++++++---------------
> tools/perf/bench/uprobe.c | 2 +-
> tools/perf/builtin-daemon.c | 8 +++----
> tools/perf/builtin-probe.c | 3 +--
> tools/perf/builtin-record.c | 24 +++++++++------------
> tools/perf/builtin-stat.c | 9 ++++----
> tools/perf/builtin-trace.c | 15 ++++++-------
> tools/perf/perf.c | 18 ++++++----------
> tools/perf/util/bpf-event.c | 11 ++++------
> tools/perf/util/bpf-utils.c | 4 ++--
> tools/perf/util/bpf_lock_contention.c | 2 +-
> tools/perf/util/cap.c | 3 +--
> tools/perf/util/data.c | 29 +++++++++----------------
> tools/perf/util/dso.c | 19 ++++++----------
> tools/perf/util/evlist.c | 31 +++++++++++++++------------
> tools/perf/util/evsel.c | 17 ++++++++-------
> tools/perf/util/jitdump.c | 3 ++-
> tools/perf/util/lzma.c | 6 +++---
> tools/perf/util/session.c | 5 +++--
> tools/perf/util/symbol-elf.c | 4 ++--
> 20 files changed, 104 insertions(+), 139 deletions(-)
>
> diff --git a/tools/perf/arch/x86/tests/bp-modify.c b/tools/perf/arch/x86/tests/bp-modify.c
> index 0924ccd9e36d..589b43273948 100644
> --- a/tools/perf/arch/x86/tests/bp-modify.c
> +++ b/tools/perf/arch/x86/tests/bp-modify.c
> @@ -80,26 +80,24 @@ static int bp_modify1(void)
> */
> if (ptrace(PTRACE_POKEUSER, child,
> offsetof(struct user, u_debugreg[0]), bp_2)) {
> - pr_debug("failed to set breakpoint, 1st time: %s\n",
> - strerror(errno));
> + pr_debug("failed to set breakpoint, 1st time: %m\n");
> goto out;
> }
>
> if (ptrace(PTRACE_POKEUSER, child,
> offsetof(struct user, u_debugreg[0]), bp_1)) {
> - pr_debug("failed to set breakpoint, 2nd time: %s\n",
> - strerror(errno));
> + pr_debug("failed to set breakpoint, 2nd time: %m\n");
> goto out;
> }
>
> if (ptrace(PTRACE_POKEUSER, child,
> offsetof(struct user, u_debugreg[7]), dr7)) {
> - pr_debug("failed to set dr7: %s\n", strerror(errno));
> + pr_debug("failed to set dr7: %m\n");
> goto out;
> }
>
> if (ptrace(PTRACE_CONT, child, NULL, NULL)) {
> - pr_debug("failed to PTRACE_CONT: %s\n", strerror(errno));
> + pr_debug("failed to PTRACE_CONT: %m\n");
> goto out;
> }
>
> @@ -112,19 +110,17 @@ static int bp_modify1(void)
> rip = ptrace(PTRACE_PEEKUSER, child,
> offsetof(struct user_regs_struct, rip), NULL);
> if (rip == (unsigned long) -1) {
> - pr_debug("failed to PTRACE_PEEKUSER: %s\n",
> - strerror(errno));
> + pr_debug("failed to PTRACE_PEEKUSER: %m\n");
> goto out;
> }
>
> pr_debug("rip %lx, bp_1 %p\n", rip, bp_1);
> -
> out:
> if (ptrace(PTRACE_DETACH, child, NULL, NULL)) {
> - pr_debug("failed to PTRACE_DETACH: %s", strerror(errno));
> + pr_debug("failed to PTRACE_DETACH: %m\n");
> return TEST_FAIL;
> - }
>
> + }
> return rip == (unsigned long) bp_1 ? TEST_OK : TEST_FAIL;
> }
>
> @@ -157,14 +153,13 @@ static int bp_modify2(void)
> */
> if (ptrace(PTRACE_POKEUSER, child,
> offsetof(struct user, u_debugreg[0]), bp_1)) {
> - pr_debug("failed to set breakpoint: %s\n",
> - strerror(errno));
> + pr_debug("failed to set breakpoint: %m\n");
> goto out;
> }
>
> if (ptrace(PTRACE_POKEUSER, child,
> offsetof(struct user, u_debugreg[7]), dr7)) {
> - pr_debug("failed to set dr7: %s\n", strerror(errno));
> + pr_debug("failed to set dr7: %m\n");
> goto out;
> }
>
> @@ -175,7 +170,7 @@ static int bp_modify2(void)
> }
>
> if (ptrace(PTRACE_CONT, child, NULL, NULL)) {
> - pr_debug("failed to PTRACE_CONT: %s\n", strerror(errno));
> + pr_debug("failed to PTRACE_CONT: %m\n");
> goto out;
> }
>
> @@ -188,8 +183,7 @@ static int bp_modify2(void)
> rip = ptrace(PTRACE_PEEKUSER, child,
> offsetof(struct user_regs_struct, rip), NULL);
> if (rip == (unsigned long) -1) {
> - pr_debug("failed to PTRACE_PEEKUSER: %s\n",
> - strerror(errno));
> + pr_debug("failed to PTRACE_PEEKUSER: %m\n");
> goto out;
> }
>
> @@ -197,7 +191,7 @@ static int bp_modify2(void)
>
> out:
> if (ptrace(PTRACE_DETACH, child, NULL, NULL)) {
> - pr_debug("failed to PTRACE_DETACH: %s", strerror(errno));
> + pr_debug("failed to PTRACE_DETACH: %m\n");
> return TEST_FAIL;
> }
>
> diff --git a/tools/perf/bench/uprobe.c b/tools/perf/bench/uprobe.c
> index 0b90275862e1..c4dac868f1ee 100644
> --- a/tools/perf/bench/uprobe.c
> +++ b/tools/perf/bench/uprobe.c
> @@ -54,7 +54,7 @@ static const char * const bench_uprobe_usage[] = {
> /*opts=*/&uprobe_opts); \
> if (!skel->links.prog) { \
> err = -errno; \
> - fprintf(stderr, "Failed to attach bench uprobe \"%s\": %s\n", #prog, strerror(errno)); \
> + fprintf(stderr, "Failed to attach bench uprobe \"%s\": %m\n", #prog); \
> goto cleanup; \
> }
>
> diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
> index f0568431fbd5..33473e071392 100644
> --- a/tools/perf/builtin-daemon.c
> +++ b/tools/perf/builtin-daemon.c
> @@ -265,8 +265,7 @@ static int check_base(struct daemon *daemon)
> daemon->base);
> return -EACCES;
> default:
> - pr_err("failed: can't access base '%s': %s\n",
> - daemon->base, strerror(errno));
> + pr_err("failed: can't access base '%s': %m\n", daemon->base);
> return -errno;
> }
> }
> @@ -544,8 +543,7 @@ static int daemon_session__control(struct daemon_session *session,
>
> err = writen(control, msg, len);
> if (err != len) {
> - pr_err("failed: write to control pipe: %d (%s)\n",
> - errno, control_path);
> + pr_err("failed: write to control pipe: %m (%s)\n", control_path);
> goto out;
> }
>
> @@ -586,7 +584,7 @@ static int setup_server_socket(struct daemon *daemon)
> int fd = socket(AF_UNIX, SOCK_STREAM, 0);
>
> if (fd < 0) {
> - fprintf(stderr, "socket: %s\n", strerror(errno));
> + fprintf(stderr, "socket: %m\n");
> return -1;
> }
>
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 69800e4d9530..1b4ba85ee019 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -211,8 +211,7 @@ static int opt_set_target_ns(const struct option *opt __maybe_unused,
> ns_pid = (pid_t)strtol(str, NULL, 10);
> if (errno != 0) {
> ret = -errno;
> - pr_warning("Failed to parse %s as a pid: %s\n", str,
> - strerror(errno));
> + pr_warning("Failed to parse %s as a pid: %m\n", str);
> return ret;
> }
> nsip = nsinfo__new(ns_pid);
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 2584d0d8bc82..b41236c0dc8b 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1286,7 +1286,6 @@ static int record__mmap_evlist(struct record *rec,
> struct record_opts *opts = &rec->opts;
> bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
> opts->auxtrace_sample_mode;
> - char msg[512];
>
> if (opts->affinity != PERF_AFFINITY_SYS)
> cpu__setup_cpunode_map();
> @@ -1305,8 +1304,7 @@ static int record__mmap_evlist(struct record *rec,
> opts->mmap_pages, opts->auxtrace_mmap_pages);
> return -errno;
> } else {
> - pr_err("failed to mmap with %d (%s)\n", errno,
> - str_error_r(errno, msg, sizeof(msg)));
> + pr_err("failed to mmap: %m\n");
> if (errno)
> return -errno;
> else
> @@ -1324,7 +1322,8 @@ static int record__mmap_evlist(struct record *rec,
> if (record__threads_enabled(rec)) {
> ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
> if (ret) {
> - pr_err("Failed to create data directory: %s\n", strerror(-ret));
> + errno = -ret;
> + pr_err("Failed to create data directory: %m\n");
> return ret;
> }
> for (i = 0; i < evlist->core.nr_mmaps; i++) {
> @@ -1461,9 +1460,8 @@ static int record__open(struct record *rec)
> }
>
> if (evlist__apply_filters(evlist, &pos, &opts->target)) {
> - pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
> - pos->filter ?: "BPF", evsel__name(pos), errno,
> - str_error_r(errno, msg, sizeof(msg)));
> + pr_err("failed to set filter \"%s\" on event %s: %m\n",
> + pos->filter ?: "BPF", evsel__name(pos));
> rc = -1;
> goto out;
> }
> @@ -1748,8 +1746,7 @@ static void *record__thread(void *arg)
>
> err = write(thread->pipes.ack[1], &msg, sizeof(msg));
> if (err == -1)
> - pr_warning("threads[%d]: failed to notify on start: %s\n",
> - thread->tid, strerror(errno));
> + pr_warning("threads[%d]: failed to notify on start: %m\n", thread->tid);
>
> pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
>
> @@ -1792,8 +1789,7 @@ static void *record__thread(void *arg)
>
> err = write(thread->pipes.ack[1], &msg, sizeof(msg));
> if (err == -1)
> - pr_warning("threads[%d]: failed to notify on termination: %s\n",
> - thread->tid, strerror(errno));
> + pr_warning("threads[%d]: failed to notify on termination: %m\n", thread->tid);
>
> return NULL;
> }
> @@ -2338,7 +2334,7 @@ static int record__start_threads(struct record *rec)
>
> sigfillset(&full);
> if (sigprocmask(SIG_SETMASK, &full, &mask)) {
> - pr_err("Failed to block signals on threads start: %s\n", strerror(errno));
> + pr_err("Failed to block signals on threads start: %m\n");
> return -1;
> }
>
> @@ -2356,7 +2352,7 @@ static int record__start_threads(struct record *rec)
> if (pthread_create(&handle, &attrs, record__thread, &thread_data[t])) {
> for (tt = 1; tt < t; tt++)
> record__terminate_thread(&thread_data[t]);
> - pr_err("Failed to start threads: %s\n", strerror(errno));
> + pr_err("Failed to start threads: %m\n");
> ret = -1;
> goto out_err;
> }
> @@ -2379,7 +2375,7 @@ static int record__start_threads(struct record *rec)
> pthread_attr_destroy(&attrs);
>
> if (sigprocmask(SIG_SETMASK, &mask, NULL)) {
> - pr_err("Failed to unblock signals on threads start: %s\n", strerror(errno));
> + pr_err("Failed to unblock signals on threads start: %m\n");
> ret = -1;
> }
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 5c06e9b61821..670dc7949718 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -935,9 +935,8 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
> }
>
> if (evlist__apply_filters(evsel_list, &counter, &target)) {
> - pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
> - counter->filter, evsel__name(counter), errno,
> - str_error_r(errno, msg, sizeof(msg)));
> + pr_err("failed to set filter \"%s\" on event %s: %m\n",
> + counter->filter, evsel__name(counter));
> return -1;
> }
>
> @@ -999,8 +998,8 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
> }
>
> if (workload_exec_errno) {
> - const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
> - pr_err("Workload failed: %s\n", emsg);
> + errno = workload_exec_errno;
> + pr_err("Workload failed: %m\n");
> err = -1;
> goto err_out;
> }
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index a743bda294bd..279b55eb3989 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -2595,12 +2595,10 @@ static struct syscall *trace__syscall_info(struct trace *trace, struct evsel *ev
> err = syscall__read_info(sc, trace);
>
> if (err && verbose > 0) {
> - char sbuf[STRERR_BUFSIZE];
> -
> - fprintf(trace->output, "Problems reading syscall %d: %d (%s)", id, -err,
> - str_error_r(-err, sbuf, sizeof(sbuf)));
> + errno = -err;
> + fprintf(trace->output, "Problems reading syscall %d: %m", id);
> if (sc && sc->name)
> - fprintf(trace->output, "(%s)", sc->name);
> + fprintf(trace->output, " (%s)", sc->name);
> fputs(" information\n", trace->output);
> }
> return err ? NULL : sc;
> @@ -4652,9 +4650,8 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
>
> out_error_apply_filters:
> fprintf(trace->output,
> - "Failed to set filter \"%s\" on event %s with %d (%s)\n",
> - evsel->filter, evsel__name(evsel), errno,
> - str_error_r(errno, errbuf, sizeof(errbuf)));
> + "Failed to set filter \"%s\" on event %s: %m\n",
> + evsel->filter, evsel__name(evsel));
> goto out_delete_evlist;
> }
> out_error_mem:
> @@ -4662,7 +4659,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
> goto out_delete_evlist;
>
> out_errno:
> - fprintf(trace->output, "errno=%d,%s\n", errno, strerror(errno));
> + fprintf(trace->output, "%m\n");
> goto out_delete_evlist;
> }
>
> diff --git a/tools/perf/perf.c b/tools/perf/perf.c
> index 88c60ecf3395..f475a8664ffc 100644
> --- a/tools/perf/perf.c
> +++ b/tools/perf/perf.c
> @@ -169,8 +169,8 @@ static int set_debug_file(const char *path)
> {
> debug_fp = fopen(path, "w");
> if (!debug_fp) {
> - fprintf(stderr, "Open debug file '%s' failed: %s\n",
> - path, strerror(errno));
> + fprintf(stderr, "Open debug file '%s' failed: %m\n",
> + path);
> return -1;
> }
>
> @@ -335,7 +335,6 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
> {
> int status;
> struct stat st;
> - char sbuf[STRERR_BUFSIZE];
>
> if (use_browser == -1)
> use_browser = check_browser_config(p->cmd);
> @@ -363,17 +362,15 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
> status = 1;
> /* Check for ENOSPC and EIO errors.. */
> if (fflush(stdout)) {
> - fprintf(stderr, "write failure on standard output: %s",
> - str_error_r(errno, sbuf, sizeof(sbuf)));
> + fprintf(stderr, "write failure on standard output: %m\n");
> goto out;
> }
> if (ferror(stdout)) {
> - fprintf(stderr, "unknown write failure on standard output");
> + fprintf(stderr, "unknown write failure on standard output\n");
> goto out;
> }
> if (fclose(stdout)) {
> - fprintf(stderr, "close failed on standard output: %s",
> - str_error_r(errno, sbuf, sizeof(sbuf)));
> + fprintf(stderr, "close failed on standard output: %m\n");
> goto out;
> }
> status = 0;
> @@ -459,7 +456,6 @@ int main(int argc, const char **argv)
> {
> int err, done_help = 0;
> const char *cmd;
> - char sbuf[STRERR_BUFSIZE];
>
> perf_debug_setup();
>
> @@ -573,8 +569,8 @@ int main(int argc, const char **argv)
> }
>
> if (cmd) {
> - fprintf(stderr, "Failed to run command '%s': %s\n",
> - cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
> + fprintf(stderr, "Failed to run command '%s': %m\n",
> + cmd);
> }
> out:
> if (debug_fp)
> diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
> index 2298cd396c42..2e6da3ad0a4f 100644
> --- a/tools/perf/util/bpf-event.c
> +++ b/tools/perf/util/bpf-event.c
> @@ -787,11 +787,10 @@ int perf_event__synthesize_bpf_events(struct perf_session *session,
> err = 0;
> break;
> }
> - pr_debug("%s: can't get next program: %s%s\n",
> - __func__, strerror(errno),
> - errno == EINVAL ? " -- kernel too old?" : "");
> /* don't report error on old kernel or EPERM */
> err = (errno == EINVAL || errno == EPERM) ? 0 : -1;
> + pr_debug("%s: can\'t get next program: %m%s\n",
> + __func__, errno == EINVAL ? " -- kernel too old?" : "");
> break;
> }
> fd = bpf_prog_get_fd_by_id(id);
> @@ -824,10 +823,8 @@ int perf_event__synthesize_bpf_events(struct perf_session *session,
> .tool = session->tool,
> };
>
> - if (kallsyms__parse(kallsyms_filename, &arg, kallsyms_process_symbol)) {
> - pr_err("%s: failed to synthesize bpf images: %s\n",
> - __func__, strerror(errno));
> - }
> + if (kallsyms__parse(kallsyms_filename, &arg, kallsyms_process_symbol))
> + pr_err("%s: failed to synthesize bpf images: %m\n", __func__);
>
> free(event);
> return err;
> diff --git a/tools/perf/util/bpf-utils.c b/tools/perf/util/bpf-utils.c
> index 5a66dc8594aa..d6d2c9c190f7 100644
> --- a/tools/perf/util/bpf-utils.c
> +++ b/tools/perf/util/bpf-utils.c
> @@ -123,7 +123,7 @@ get_bpf_prog_info_linear(int fd, __u64 arrays)
> /* step 1: get array dimensions */
> err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
> if (err) {
> - pr_debug("can't get prog info: %s", strerror(errno));
> + pr_debug("can't get prog info: %m\n");
> return ERR_PTR(-EFAULT);
> }
> if (info.type >= __MAX_BPF_PROG_TYPE)
> @@ -186,7 +186,7 @@ get_bpf_prog_info_linear(int fd, __u64 arrays)
> /* step 5: call syscall again to get required arrays */
> err = bpf_obj_get_info_by_fd(fd, &info_linear->info, &info_len);
> if (err) {
> - pr_debug("can't get prog info: %s", strerror(errno));
> + pr_debug("can't get prog info: %m\n");
> free(info_linear);
> return ERR_PTR(-EFAULT);
> }
> diff --git a/tools/perf/util/bpf_lock_contention.c b/tools/perf/util/bpf_lock_contention.c
> index 7b5671f13c53..788d30be2058 100644
> --- a/tools/perf/util/bpf_lock_contention.c
> +++ b/tools/perf/util/bpf_lock_contention.c
> @@ -42,7 +42,7 @@ static void check_slab_cache_iter(struct lock_contention *con)
>
> con->btf = btf__load_vmlinux_btf();
> if (con->btf == NULL) {
> - pr_debug("BTF loading failed: %s\n", strerror(errno));
> + pr_debug("BTF loading failed: %m\n");
> return;
> }
>
> diff --git a/tools/perf/util/cap.c b/tools/perf/util/cap.c
> index 24a0ea7e6d97..ac6d1d9a523d 100644
> --- a/tools/perf/util/cap.c
> +++ b/tools/perf/util/cap.c
> @@ -28,8 +28,7 @@ bool perf_cap__capable(int cap, bool *used_root)
> header.version == _LINUX_CAPABILITY_VERSION_1)
> continue;
>
> - pr_debug2("capget syscall failed (%s - %d) fall back on root check\n",
> - strerror(errno), errno);
> + pr_debug2("capget syscall failed (%m) fall back on root check\n");
> *used_root = true;
> return geteuid() == 0;
> }
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index 164eb45a0b36..90df41da1a32 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -213,17 +213,15 @@ static int check_backup(struct perf_data *data)
>
> ret = rm_rf_perf_data(oldname);
> if (ret) {
> - pr_err("Can't remove old data: %s (%s)\n",
> - ret == -2 ?
> - "Unknown file found" : strerror(errno),
> - oldname);
> + if (ret == -2)
> + pr_err("Can't remove old data: Unknown file found (%s)\n", oldname);
> + else
> + pr_err("Can't remove old data: %m (%s)\n", oldname);
> return -1;
> }
>
> if (rename(data->path, oldname)) {
> - pr_err("Can't move data: %s (%s to %s)\n",
> - strerror(errno),
> - data->path, oldname);
> + pr_err("Can't move data: %m (%s to %s)\n", data->path, oldname);
> return -1;
> }
> }
> @@ -246,14 +244,12 @@ static int open_file_read(struct perf_data *data)
> int flags = data->in_place_update ? O_RDWR : O_RDONLY;
> struct stat st;
> int fd;
> - char sbuf[STRERR_BUFSIZE];
>
> fd = open(data->file.path, flags);
> if (fd < 0) {
> int err = errno;
>
> - pr_err("failed to open %s: %s", data->file.path,
> - str_error_r(err, sbuf, sizeof(sbuf)));
> + pr_err("failed to open %s: %m", data->file.path);
> if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
> pr_err(" (try 'perf record' first)");
> pr_err("\n");
> @@ -285,15 +281,10 @@ static int open_file_read(struct perf_data *data)
>
> static int open_file_write(struct perf_data *data)
> {
> - int fd;
> - char sbuf[STRERR_BUFSIZE];
> -
> - fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
> - S_IRUSR|S_IWUSR);
> + int fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC, S_IRUSR|S_IWUSR);
>
> if (fd < 0)
> - pr_err("failed to open %s : %s\n", data->file.path,
> - str_error_r(errno, sbuf, sizeof(sbuf)));
> + pr_err("failed to open %s : %m\n", data->file.path);
>
> return fd;
> }
> @@ -436,8 +427,8 @@ int perf_data__switch(struct perf_data *data,
>
> if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
> ret = -errno;
> - pr_debug("Failed to lseek to %zu: %s",
> - pos, strerror(errno));
> + pr_debug("Failed to lseek to %zu: %m\n",
> + pos);
> goto out;
> }
> }
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index 344e689567ee..eb7011374324 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -539,16 +539,13 @@ static void close_first_dso(void);
>
> static int do_open(char *name) EXCLUSIVE_LOCKS_REQUIRED(_dso__data_open_lock)
> {
> - int fd;
> - char sbuf[STRERR_BUFSIZE];
> -
> do {
> - fd = open(name, O_RDONLY|O_CLOEXEC);
> + int fd = open(name, O_RDONLY|O_CLOEXEC);
> +
> if (fd >= 0)
> return fd;
>
> - pr_debug("dso open failed: %s\n",
> - str_error_r(errno, sbuf, sizeof(sbuf)));
> + pr_debug("dso open failed: %m\n");
> if (!dso__data_open_cnt || errno != EMFILE)
> break;
>
> @@ -1097,7 +1094,6 @@ static int file_size(struct dso *dso, struct machine *machine)
> {
> int ret = 0;
> struct stat st;
> - char sbuf[STRERR_BUFSIZE];
>
> mutex_lock(dso__data_open_lock());
>
> @@ -1115,8 +1111,7 @@ static int file_size(struct dso *dso, struct machine *machine)
>
> if (fstat(dso__data(dso)->fd, &st) < 0) {
> ret = -errno;
> - pr_err("dso cache fstat failed: %s\n",
> - str_error_r(errno, sbuf, sizeof(sbuf)));
> + pr_err("dso cache fstat failed: %m\n");
> dso__data(dso)->status = DSO_DATA_STATUS_ERROR;
> goto out;
> }
> @@ -1771,10 +1766,8 @@ int dso__strerror_load(struct dso *dso, char *buf, size_t buflen)
> BUG_ON(buflen == 0);
>
> if (errnum >= 0) {
> - const char *err = str_error_r(errnum, buf, buflen);
> -
> - if (err != buf)
> - scnprintf(buf, buflen, "%s", err);
> + errno = errnum;
> + scnprintf(buf, buflen, "%m");
>
> return 0;
> }
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index e8217efdda53..1f552cb1733a 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -1613,14 +1613,14 @@ int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *even
> int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
> {
> int printed, value;
> - char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
>
> switch (err) {
> case EACCES:
> case EPERM:
> + errno = err;
> printed = scnprintf(buf, size,
> - "Error:\t%s.\n"
> - "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
> + "Error:\t%m.\n"
> + "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.");
>
> value = perf_event_paranoid();
>
> @@ -1647,16 +1647,18 @@ int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size
> if (first->core.attr.sample_freq < (u64)max_freq)
> goto out_default;
>
> + errno = err;
> printed = scnprintf(buf, size,
> - "Error:\t%s.\n"
> + "Error:\t%m.\n"
> "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n"
> "Hint:\tThe current value is %d and %" PRIu64 " is being requested.",
> - emsg, max_freq, first->core.attr.sample_freq);
> + max_freq, first->core.attr.sample_freq);
> break;
> }
> default:
> out_default:
> - scnprintf(buf, size, "%s", emsg);
> + errno = err;
> + scnprintf(buf, size, "%m");
> break;
> }
>
> @@ -1665,17 +1667,17 @@ int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size
>
> int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
> {
> - char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
> int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
>
> switch (err) {
> case EPERM:
> sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
> + errno = err;
> printed += scnprintf(buf + printed, size - printed,
> - "Error:\t%s.\n"
> + "Error:\t%m.\n"
> "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
> "Hint:\tTried using %zd kB.\n",
> - emsg, pages_max_per_user, pages_attempted);
> + pages_max_per_user, pages_attempted);
>
> if (pages_attempted >= pages_max_per_user) {
> printed += scnprintf(buf + printed, size - printed,
> @@ -1687,7 +1689,8 @@ int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size
> "Hint:\tTry using a smaller -m/--mmap-pages value.");
> break;
> default:
> - scnprintf(buf, size, "%s", emsg);
> + errno = err;
> + scnprintf(buf, size, "%m");
> break;
> }
>
> @@ -1919,8 +1922,8 @@ static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_
> */
> fd = open(s, O_RDWR | O_NONBLOCK | O_CLOEXEC);
> if (fd < 0) {
> - pr_err("Failed to open '%s'\n", s);
> ret = -errno;
> + pr_err("Failed to open '%s': %m\n", s);
> goto out_free;
> }
> *ctl_fd = fd;
> @@ -1930,7 +1933,7 @@ static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_
> /* O_RDWR | O_NONBLOCK means the other end need not be open */
> fd = open(p, O_RDWR | O_NONBLOCK | O_CLOEXEC);
> if (fd < 0) {
> - pr_err("Failed to open '%s'\n", p);
> + pr_err("Failed to open '%s': %m\n", p);
> ret = -errno;
> goto out_free;
> }
> @@ -2362,7 +2365,7 @@ int evlist__parse_event_enable_time(struct evlist *evlist, struct record_opts *o
> eet->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
> if (eet->timerfd == -1) {
> err = -errno;
> - pr_err("timerfd_create failed: %s\n", strerror(errno));
> + pr_err("timerfd_create failed: %m\n");
> goto free_eet_times;
> }
>
> @@ -2397,7 +2400,7 @@ static int event_enable_timer__set_timer(struct event_enable_timer *eet, int ms)
>
> if (timerfd_settime(eet->timerfd, 0, &its, NULL) < 0) {
> err = -errno;
> - pr_err("timerfd_settime failed: %s\n", strerror(errno));
> + pr_err("timerfd_settime failed: %m\n");
> }
> return err;
> }
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 989c56d4a23f..6e94d12e82e0 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -647,8 +647,9 @@ struct tep_event *evsel__tp_format(struct evsel *evsel)
> if (IS_ERR(tp_format)) {
> int err = -PTR_ERR(evsel->tp_format);
>
> - pr_err("Error getting tracepoint format '%s' '%s'(%d)\n",
> - evsel__name(evsel), strerror(err), err);
> + errno = err;
> + pr_err("Error getting tracepoint format '%s': %m\n",
> + evsel__name(evsel));
> return NULL;
> }
> evsel->tp_format = tp_format;
> @@ -2751,8 +2752,8 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
> PERF_EVENT_IOC_SET_BPF,
> bpf_fd);
> if (err && errno != EEXIST) {
> - pr_err("failed to attach bpf fd %d: %s\n",
> - bpf_fd, strerror(errno));
> + pr_err("failed to attach bpf fd %d: %m\n",
> + bpf_fd);
> err = -EINVAL;
> goto out_close;
> }
> @@ -3816,7 +3817,6 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
> int err, char *msg, size_t size)
> {
> struct perf_pmu *pmu;
> - char sbuf[STRERR_BUFSIZE];
> int printed = 0, enforced = 0;
> int ret;
>
> @@ -3949,10 +3949,11 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
> if (ret)
> return ret;
>
> + errno = err;
> return scnprintf(msg, size,
> - "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
> - "\"dmesg | grep -i perf\" may provide additional information.\n",
> - err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
> + "The sys_perf_event_open() syscall failed for event (%s): %m\n"
> + "\"dmesg | grep -i perf\" may provide additional information.\n",
> + evsel__name(evsel));
> }
>
> struct perf_session *evsel__session(struct evsel *evsel)
> diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c
> index b062b1f234b6..124c5ad64f46 100644
> --- a/tools/perf/util/jitdump.c
> +++ b/tools/perf/util/jitdump.c
> @@ -90,7 +90,8 @@ jit_emit_elf(struct jit_buf_desc *jd,
> saved_errno = errno;
> nsinfo__mountns_exit(&nsc);
> if (fd == -1) {
> - pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(saved_errno));
> + errno = saved_errno;
> + pr_warning("cannot create jit ELF %s: %m\n", filename);
> return -1;
> }
>
> diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c
> index c355757ed391..91b9b5171d1f 100644
> --- a/tools/perf/util/lzma.c
> +++ b/tools/perf/util/lzma.c
> @@ -59,7 +59,7 @@ int lzma_decompress_stream_to_file(FILE *infile, int output_fd)
> strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
>
> if (ferror(infile)) {
> - pr_debug("lzma: read error: %s\n", strerror(errno));
> + pr_debug("lzma: read error: %m\n");
> goto err_lzma_end;
> }
>
> @@ -73,7 +73,7 @@ int lzma_decompress_stream_to_file(FILE *infile, int output_fd)
> ssize_t write_size = sizeof(buf_out) - strm.avail_out;
>
> if (writen(output_fd, buf_out, write_size) != write_size) {
> - pr_debug("lzma: write error: %s\n", strerror(errno));
> + pr_debug("lzma: write error: %m\n");
> goto err_lzma_end;
> }
>
> @@ -103,7 +103,7 @@ int lzma_decompress_to_file(const char *input, int output_fd)
>
> infile = fopen(input, "rb");
> if (!infile) {
> - pr_debug("lzma: fopen failed on %s: '%s'\n", input, strerror(errno));
> + pr_debug("lzma: fopen failed on %s: '%m'\n", input);
> return -1;
> }
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 4b0236b2df29..1ae3e5d579a1 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -2186,9 +2186,10 @@ reader__read_event(struct reader *rd, struct perf_session *session,
>
> if (size < sizeof(struct perf_event_header) ||
> (skip = rd->process(session, event, rd->file_pos, rd->path)) < 0) {
> - pr_err("%#" PRIx64 " [%#x]: failed to process type: %d [%s]\n",
> + errno = -skip;
> + pr_err("%#" PRIx64 " [%#x]: failed to process type: %d [%m]\n",
> rd->file_offset + rd->head, event->header.size,
> - event->header.type, strerror(-skip));
> + event->header.type);
> err = skip;
> goto out;
> }
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index 9e820599bab3..d0625837596b 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -1102,14 +1102,14 @@ static Elf *read_gnu_debugdata(struct dso *dso, Elf *elf, const char *name, int
>
> wrapped = fmemopen(scn_data->d_buf, scn_data->d_size, "r");
> if (!wrapped) {
> - pr_debug("%s: fmemopen: %s\n", __func__, strerror(errno));
> + pr_debug("%s: fmemopen: %m\n", __func__);
> *dso__load_errno(dso) = -errno;
> return NULL;
> }
>
> temp_fd = mkstemp(temp_filename);
> if (temp_fd < 0) {
> - pr_debug("%s: mkstemp: %s\n", __func__, strerror(errno));
> + pr_debug("%s: mkstemp: %m\n", __func__);
> *dso__load_errno(dso) = -errno;
> fclose(wrapped);
> return NULL;
> --
> 2.52.0.rc1.455.g30608eb744-goog
>
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