diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-06-06 16:39:00 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-07-24 16:04:12 -0700 |
| commit | b3c983142d4584c9d506b1ed31b65f4292b4aea8 (patch) | |
| tree | 55b6642d8844a87d245034ed219f44c17b69ea0a /include/trace/events/rcu.h | |
| parent | 5e741fa9e9698f4010bb85eff252186f7a4071f4 (diff) | |
| download | lwn-b3c983142d4584c9d506b1ed31b65f4292b4aea8.tar.gz lwn-b3c983142d4584c9d506b1ed31b65f4292b4aea8.zip | |
rcutorture: Place event-traced strings into trace buffer
Strings used in event tracing need to be specially handled, for example,
being copied to the trace buffer instead of being pointed to by the trace
buffer. Although the TPS() macro can be used to "launder" pointed-to
strings, this might not be all that effective within a loadable module.
This commit therefore copies rcutorture's strings to the trace buffer.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/trace/events/rcu.h')
| -rw-r--r-- | include/trace/events/rcu.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h index 91dc089d65b7..e91ae1f2290d 100644 --- a/include/trace/events/rcu.h +++ b/include/trace/events/rcu.h @@ -703,6 +703,7 @@ TRACE_EVENT(rcu_batch_end, * at the beginning and end of the read, respectively. Note that the * callback address can be NULL. */ +#define RCUTORTURENAME_LEN 8 TRACE_EVENT(rcu_torture_read, TP_PROTO(const char *rcutorturename, struct rcu_head *rhp, @@ -711,7 +712,7 @@ TRACE_EVENT(rcu_torture_read, TP_ARGS(rcutorturename, rhp, secs, c_old, c), TP_STRUCT__entry( - __field(const char *, rcutorturename) + __field(char, rcutorturename[RCUTORTURENAME_LEN]) __field(struct rcu_head *, rhp) __field(unsigned long, secs) __field(unsigned long, c_old) @@ -719,7 +720,9 @@ TRACE_EVENT(rcu_torture_read, ), TP_fast_assign( - __entry->rcutorturename = rcutorturename; + strncpy(__entry->rcutorturename, rcutorturename, + RCUTORTURENAME_LEN); + __entry->rcutorturename[RCUTORTURENAME_LEN - 1] = 0; __entry->rhp = rhp; __entry->secs = secs; __entry->c_old = c_old; |