diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2009-03-18 08:58:44 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-03-18 10:10:17 +0100 |
| commit | 50d88758a3f9787cbdbdbc030560b815721eab4b (patch) | |
| tree | 02e5c47c5c5bd05e578d1883ccaa1e3bc13c703a /kernel | |
| parent | tracing: replace the crude (unsigned) -1 hackery (diff) | |
| download | linux-dev-50d88758a3f9787cbdbdbc030560b815721eab4b.tar.xz linux-dev-50d88758a3f9787cbdbdbc030560b815721eab4b.zip | |
tracing: fix trace_find_cmdline()
Impact: prevent stale command line output
In case there is no valid command line mapping for a pid
trace_find_cmdline() returns without updating the comm buffer. The
trace dump keeps the previous entry which results in confusing trace
output:
<idle>-0 [000] 280.702056 ....
<idle>-23456 [000] 280.702080 ....
Update the comm buffer with "<...>" when no mapping is found.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index ca673c475687..06c69a260328 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -787,12 +787,11 @@ void trace_find_cmdline(int pid, char comm[]) __raw_spin_lock(&trace_cmdline_lock); map = map_pid_to_cmdline[pid]; - if (map == NO_CMDLINE_MAP) - goto out; - - strcpy(comm, saved_cmdlines[map]); + if (map != NO_CMDLINE_MAP) + strcpy(comm, saved_cmdlines[map]); + else + strcpy(comm, "<...>"); - out: __raw_spin_unlock(&trace_cmdline_lock); } |