tools lib api fs: Make tracing_path_strerror_open message generic

Making tracing_path__strerror_open_tp message generic by mentioning both
debugfs/tracefs words in error message plus the tracing_path instead of
debugfs_mountpoint.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1441180605-24737-7-git-send-email-jolsa@kernel.org
[ Add comment for the ENOENT case out of this patch discussion thread ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 10 deletions

diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 3b3e4f5fc50b..1e0bb0da5e4f 100644
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -90,33 +90,39 @@ static int strerror_open(int err, char *buf, size_t size, const char *filename)
 
         switch (err) {
         case ENOENT:
-                if (debugfs_configured()) {
+                /*
+                 * We will get here if we can't find the tracepoint, but one of
+                 * debugfs or tracefs is configured, which means you probably
+                 * want some tracepoint which wasn't compiled in your kernel.
+                 * - jirka
+                 */
+                if (debugfs_configured() || tracefs_configured()) {
                         snprintf(buf, size,
                                  "Error:\tFile %s/%s not found.\n"
                                  "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
-                                 debugfs_mountpoint, filename);
+                                 tracing_events_path, filename);
                         break;
                 }
                 snprintf(buf, size, "%s",
-                         "Error:\tUnable to find debugfs\n"
-                         "Hint:\tWas your kernel compiled with debugfs support?\n"
-                         "Hint:\tIs the debugfs filesystem mounted?\n"
+                         "Error:\tUnable to find debugfs/tracefs\n"
+                         "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n"
+                         "Hint:\tIs the debugfs/tracefs filesystem mounted?\n"
                          "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
                 break;
         case EACCES: {
-                const char *mountpoint = debugfs_mountpoint;
+                const char *mountpoint = debugfs_find_mountpoint();
 
-                if (!access(debugfs_mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
+                if (!access(mountpoint, R_OK) && strncmp(filename, "tracing/", 8) == 0) {
                         const char *tracefs_mntpoint = tracefs_find_mountpoint();
 
                         if (tracefs_mntpoint)
-                                mountpoint = tracefs_mntpoint;
+                                mountpoint = tracefs_find_mountpoint();
                 }
 
                 snprintf(buf, size,
                          "Error:\tNo permissions to read %s/%s\n"
                          "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
-                         debugfs_mountpoint, filename, mountpoint);
+                         tracing_events_path, filename, mountpoint);
         }
                 break;
         default:
@@ -131,7 +137,7 @@ int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *
 {
         char path[PATH_MAX];
 
-        snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*");
+        snprintf(path, PATH_MAX, "%s/%s", sys, name ?: "*");
 
         return strerror_open(err, buf, size, path);
 }