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perf tools: Fix snprint warnings for gcc 8 

commit 77f18153c0 upstream.

With gcc 8 we get new set of snprintf() warnings that breaks the
compilation, one example:

  tests/mem.c: In function ‘check’:
  tests/mem.c:19:48: error: ‘%s’ directive output may be truncated writing \
        up to 99 bytes into a region of size 89 [-Werror=format-truncation=]
    snprintf(failure, sizeof failure, "unexpected %s", out);

The gcc docs says:

 To avoid the warning either use a bigger buffer or handle the
 function's return value which indicates whether or not its output
 has been truncated.

Given that all these warnings are harmless, because the code either
properly fails due to uncomplete file path or we don't care for
truncated output at all, I'm changing all those snprintf() calls to
scnprintf(), which actually 'checks' for the snprint return value so the
gcc stays silent.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Link: http://lkml.kernel.org/r/20180319082902.4518-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ignat Korchagin <ignat@cloudflare.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Jiri Olsa 2018-03-19 09:29:01 +01:00 committed by Greg Kroah-Hartman
parent 57bff812c4
commit d0c9f9f9fb
7 changed files with 19 additions and 19 deletions
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22
tools/perf/builtin-script.c
View File

@ -2304,8 +2304,8 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
}
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
scnprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
@ -2314,8 +2314,8 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
script_root = get_script_root(script_dirent, REPORT_SUFFIX);
if (script_root) {
desc = script_desc__findnew(script_root);
snprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
scnprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
read_script_info(desc, script_path);
free(script_root);
}
@ -2351,7 +2351,7 @@ static int check_ev_match(char *dir_name, char *scriptname,
int match, len;
FILE *fp;
sprintf(filename, "%s/bin/%s-record", dir_name, scriptname);
scnprintf(filename, MAXPATHLEN, "%s/bin/%s-record", dir_name, scriptname);
fp = fopen(filename, "r");
if (!fp)
@ -2427,8 +2427,8 @@ int find_scripts(char **scripts_array, char **scripts_path_array)
}
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
snprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path,
lang_dirent->d_name);
scnprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path,
lang_dirent->d_name);
#ifdef NO_LIBPERL
if (strstr(lang_path, "perl"))
continue;
@ -2483,8 +2483,8 @@ static char *get_script_path(const char *script_root, const char *suffix)
return NULL;
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
scnprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent->d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
@ -2495,8 +2495,8 @@ static char *get_script_path(const char *script_root, const char *suffix)
free(__script_root);
closedir(lang_dir);
closedir(scripts_dir);
snprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
scnprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent->d_name);
return strdup(script_path);
}
free(__script_root);

4
tools/perf/tests/attr.c
View File

@ -164,8 +164,8 @@ static int run_dir(const char *d, const char *perf)
if (verbose > 0)
vcnt++;
snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
d, d, perf, vcnt, v);
scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
d, d, perf, vcnt, v);
return system(cmd) ? TEST_FAIL : TEST_OK;
}

2
tools/perf/tests/mem.c
View File

@ -16,7 +16,7 @@ static int check(union perf_mem_data_src data_src,
n = perf_mem__snp_scnprintf(out, sizeof out, &mi);
n += perf_mem__lvl_scnprintf(out + n, sizeof out - n, &mi);
snprintf(failure, sizeof failure, "unexpected %s", out);
scnprintf(failure, sizeof failure, "unexpected %s", out);
TEST_ASSERT_VAL(failure, !strcmp(string, out));
return 0;
}

2
tools/perf/tests/pmu.c
View File

@ -98,7 +98,7 @@ static char *test_format_dir_get(void)
struct test_format *format = &test_formats[i];
FILE *file;
snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
scnprintf(name, PATH_MAX, "%s/%s", dir, format->name);
file = fopen(name, "w");
if (!file)

2
tools/perf/util/cgroup.c
View File

@ -78,7 +78,7 @@ static int open_cgroup(char *name)
if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1))
return -1;
snprintf(path, PATH_MAX, "%s/%s", mnt, name);
scnprintf(path, PATH_MAX, "%s/%s", mnt, name);
fd = open(path, O_RDONLY);
if (fd == -1)

4
tools/perf/util/parse-events.c
View File

@ -202,8 +202,8 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
for_each_event(sys_dirent, evt_dir, evt_dirent) {
snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent->d_name);
scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent->d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;

2
tools/perf/util/pmu.c
View File

@ -349,7 +349,7 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
if (pmu_alias_info_file(name))
continue;
snprintf(path, PATH_MAX, "%s/%s", dir, name);
scnprintf(path, PATH_MAX, "%s/%s", dir, name);
file = fopen(path, "r");
if (!file) {