[1] and [2] introduced a new gid mount options that could apply to a group to all entries in tracefs. Document this in the tracing readme. [1] https://lore.kernel.org/r/20211208075720.4855d180@xxxxxxxxxxxxxxxxxx/T/#u [2] https://lore.kernel.org/r/20211207171729.2a54e1b3@xxxxxxxxxxxxxxxxxx/T/#u Cc: David Howells <dhowells@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Signed-off-by: Kalesh Singh <kaleshsingh@xxxxxxxxxx> --- kernel/trace/trace.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a8f52b6527ca..2b64b3ec67d9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5501,6 +5501,10 @@ static const struct file_operations tracing_iter_fops = { static const char readme_msg[] = "tracing mini-HOWTO:\n\n" + "By default tracefs removes all OTH file permission bits.\n" + "When mounting tracefs an optional group id can be specified\n" + "which adds the group to every directory and file in tracefs:\n\n" + "\t e.g. mount -t tracefs [-o [gid=<gid>]] nodev /sys/kernel/tracing\n\n" "# echo 0 > tracing_on : quick way to disable tracing\n" "# echo 1 > tracing_on : quick way to re-enable tracing\n\n" " Important files:\n" -- 2.47.0.163.g1226f6d8fa-goog
