perf probe: Fix error message if get_real_path() failed
Perf probe -L shows incorrect error message (Dwarf error) if it fails to find
source file. This can confuse users.
# ./perf probe -s /nowhere -L vfs_read
Debuginfo analysis failed. (-2)
Error: Failed to show lines. (-2)
With this patch, it shows correct message.
# ./perf probe -s /nowhere -L vfs_read
Failed to find source file. (-2)
Error: Failed to show lines. (-2)
LKML-Reference: <4C36EBDB.4020308@hitachi.com>
Cc: Chase Douglas <chase.douglas@canonical.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 3e64e1f..a934a36 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -58,55 +58,6 @@
return 0;
}
-/*
- * Find a src file from a DWARF tag path. Prepend optional source path prefix
- * and chop off leading directories that do not exist. Result is passed back as
- * a newly allocated path on success.
- * Return 0 if file was found and readable, -errno otherwise.
- */
-static int get_real_path(const char *raw_path, char **new_path)
-{
- if (!symbol_conf.source_prefix) {
- if (access(raw_path, R_OK) == 0) {
- *new_path = strdup(raw_path);
- return 0;
- } else
- return -errno;
- }
-
- *new_path = malloc((strlen(symbol_conf.source_prefix) +
- strlen(raw_path) + 2));
- if (!*new_path)
- return -ENOMEM;
-
- for (;;) {
- sprintf(*new_path, "%s/%s", symbol_conf.source_prefix,
- raw_path);
-
- if (access(*new_path, R_OK) == 0)
- return 0;
-
- switch (errno) {
- case ENAMETOOLONG:
- case ENOENT:
- case EROFS:
- case EFAULT:
- raw_path = strchr(++raw_path, '/');
- if (!raw_path) {
- free(*new_path);
- *new_path = NULL;
- return -ENOENT;
- }
- continue;
-
- default:
- free(*new_path);
- *new_path = NULL;
- return -errno;
- }
- }
-}
-
/* Line number list operations */
/* Add a line to line number list */
@@ -1256,13 +1207,11 @@
static int line_range_add_line(const char *src, unsigned int lineno,
struct line_range *lr)
{
- int ret;
-
- /* Copy real path */
+ /* Copy source path */
if (!lr->path) {
- ret = get_real_path(src, &lr->path);
- if (ret != 0)
- return ret;
+ lr->path = strdup(src);
+ if (lr->path == NULL)
+ return -ENOMEM;
}
return line_list__add_line(&lr->line_list, lineno);
}
@@ -1460,7 +1409,7 @@
}
off = noff;
}
- pr_debug("path: %lx\n", (unsigned long)lr->path);
+ pr_debug("path: %s\n", lr->path);
dwarf_end(dbg);
return (ret < 0) ? ret : lf.found;