diff options
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index aff5f80b59b8..bf05fb49a6f3 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -606,23 +606,22 @@ static int create_trace_probe(int argc, char **argv) */ struct trace_probe *tp; int i, ret = 0; - int is_return = 0; + int is_return = 0, is_delete = 0; char *symbol = NULL, *event = NULL, *arg = NULL, *group = NULL; unsigned long offset = 0; void *addr = NULL; char buf[MAX_EVENT_NAME_LEN]; - if (argc < 2) { - pr_info("Probe point is not specified.\n"); - return -EINVAL; - } - + /* argc must be >= 1 */ if (argv[0][0] == 'p') is_return = 0; else if (argv[0][0] == 'r') is_return = 1; + else if (argv[0][0] == '-') + is_delete = 1; else { - pr_info("Probe definition must be started with 'p' or 'r'.\n"); + pr_info("Probe definition must be started with 'p', 'r' or" + " '-'.\n"); return -EINVAL; } @@ -642,7 +641,29 @@ static int create_trace_probe(int argc, char **argv) return -EINVAL; } } + if (!group) + group = KPROBE_EVENT_SYSTEM; + if (is_delete) { + if (!event) { + pr_info("Delete command needs an event name.\n"); + return -EINVAL; + } + tp = find_probe_event(event, group); + if (!tp) { + pr_info("Event %s/%s doesn't exist.\n", group, event); + return -ENOENT; + } + /* delete an event */ + unregister_trace_probe(tp); + free_trace_probe(tp); + return 0; + } + + if (argc < 2) { + pr_info("Probe point is not specified.\n"); + return -EINVAL; + } if (isdigit(argv[1][0])) { if (is_return) { pr_info("Return probe point must be a symbol.\n"); @@ -671,8 +692,6 @@ static int create_trace_probe(int argc, char **argv) argc -= 2; argv += 2; /* setup a probe */ - if (!group) - group = KPROBE_EVENT_SYSTEM; if (!event) { /* Make a new event name */ if (symbol) |
