perf probe: Fix to use correct debugfs path finder

Instead of using debugfs_path, use debugfs_find_mountpoint()
to find actual debugfs path.

LKML-Reference: <20100414223928.14630.38326.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Reported-by: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 10 insertions, 6 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 64bc11a183bf..c1e54035e8cf 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -40,7 +40,6 @@
 #include "util/debug.h"
 #include "util/debugfs.h"
 #include "util/parse-options.h"
-#include "util/parse-events.h"  /* For debugfs_path */
 #include "util/probe-finder.h"
 #include "util/probe-event.h"
 
@@ -205,9 +204,6 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
              !params.show_lines))
                 usage_with_options(probe_usage, options);
 
-        if (debugfs_valid_mountpoint(debugfs_path) < 0)
-                die("Failed to find debugfs path.");
-
         if (params.list_events) {
                 if (params.nevents != 0 || params.dellist) {
                         pr_err("  Error: Don't use --list with --add/--del.\n");
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index ca108b2cd15f..1c4a20a284c0 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -42,8 +42,8 @@
 #include "color.h"
 #include "symbol.h"
 #include "thread.h"
+#include "debugfs.h"
 #include "trace-event.h"        /* For __unused */
-#include "parse-events.h"       /* For debugfs_path */
 #include "probe-event.h"
 #include "probe-finder.h"
 
@@ -1075,10 +1075,18 @@ void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
 static int open_kprobe_events(bool readwrite)
 {
         char buf[PATH_MAX];
+        const char *__debugfs;
         int ret;
 
-        ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path);
+        __debugfs = debugfs_find_mountpoint();
+        if (__debugfs == NULL) {
+                pr_warning("Debugfs is not mounted.\n");
+                return -ENOENT;
+        }
+
+        ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
         if (ret >= 0) {
+                pr_debug("Opening %s write=%d\n", buf, readwrite);
                 if (readwrite && !probe_event_dry_run)
                         ret = open(buf, O_RDWR, O_APPEND);
                 else