perf pmu: Use relative path in setup_pmu_alias_list()

Likewise, x86 needs to traverse the PMU list to build alias.
Let's use the new helpers to use relative paths.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230331202949.810326-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
index f73b80d..3c0de33 100644 (file)
--- a/tools/perf/arch/x86/util/pmu.c
+++ b/tools/perf/arch/x86/util/pmu.c
@@ -71,7 +71,7 @@ out_delete:
 
 static int setup_pmu_alias_list(void)
 {
-       char path[PATH_MAX];
+       int fd, dirfd;
        DIR *dir;
        struct dirent *dent;
        struct pmu_alias *pmu_alias;
@@ -79,10 +79,11 @@ static int setup_pmu_alias_list(void)
        FILE *file;
        int ret = -ENOMEM;
 
-       if (!perf_pmu__event_source_devices_scnprintf(path, sizeof(path)))
+       dirfd = perf_pmu__event_source_devices_fd();
+       if (dirfd < 0)
                return -1;
 
-       dir = opendir(path);
+       dir = fdopendir(dirfd);
        if (!dir)
                return -errno;
 
@@ -91,11 +92,11 @@ static int setup_pmu_alias_list(void)
                    !strcmp(dent->d_name, ".."))
                        continue;
 
-               perf_pmu__pathname_scnprintf(path, sizeof(path), dent->d_name, "alias");
-               if (!file_available(path))
+               fd = perf_pmu__pathname_fd(dirfd, dent->d_name, "alias", O_RDONLY);
+               if (fd < 0)
                        continue;
 
-               file = fopen(path, "r");
+               file = fdopen(fd, "r");
                if (!file)
                        continue;