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Diffstat (limited to 'tools/lib/api/fs/debugfs.c')
-rw-r--r--tools/lib/api/fs/debugfs.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index 8305b3e9d48e..eb7cf4d18f8a 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include "debugfs.h"
+#include "tracefs.h"
#ifndef DEBUGFS_DEFAULT_PATH
#define DEBUGFS_DEFAULT_PATH "/sys/kernel/debug"
@@ -94,11 +95,21 @@ int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename
"Hint:\tIs the debugfs filesystem mounted?\n"
"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
break;
- case EACCES:
+ case EACCES: {
+ const char *mountpoint = debugfs_mountpoint;
+
+ if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
+ const char *tracefs_mntpoint = tracefs_find_mountpoint();
+
+ if (tracefs_mntpoint)
+ mountpoint = tracefs_mntpoint;
+ }
+
snprintf(buf, size,
"Error:\tNo permissions to read %s/%s\n"
"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
- debugfs_mountpoint, filename, debugfs_mountpoint);
+ debugfs_mountpoint, filename, mountpoint);
+ }
break;
default:
snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));