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authorArnaldo Carvalho de Melo <acme@redhat.com>2015-01-22 16:35:42 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-01-22 17:02:23 -0300
commitf816b3cc99804a9f771315331deb36abec47f5b4 (patch)
tree25868dac6f71cf91e6a2b63ef6b565b3632dd112 /tools/lib/api/fs
parent2cc990ba3af4f9511f0d016c73b8163591f890e7 (diff)
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tools lib fs debugfs: Check if debugfs is mounted when handling ENOENT
If debugfs was already mounted, then its a matter of not finding the tracepoint, tell the user that perhaps a CONFIG_ setting is not enabled. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-6chfytoflyx3jwfqm7ebltu0@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib/api/fs')
-rw-r--r--tools/lib/api/fs/debugfs.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index bf9e21648894..d2b18e887071 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -106,6 +106,13 @@ int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename
switch (err) {
case ENOENT:
+ if (debugfs_found) {
+ 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);
+ break;
+ }
snprintf(buf, size, "%s",
"Error:\tUnable to find debugfs\n"
"Hint:\tWas your kernel compiled with debugfs support?\n"