[PATCH 16/21] tracing/uprobe: Add per-probe delete from event

[Masami Hiramatsu]

Add per-probe delete method from one event passing the head of
definition. In other words, the events which match the head
N parameters are deleted.

Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 kernel/trace/trace_uprobe.c |   31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 1bd6c29cc0f3..d2e200729c23 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -284,13 +284,42 @@ static bool trace_uprobe_is_busy(struct dyn_event *ev)
        return trace_probe_is_enabled(&tu->tp);
 }
 
+static bool trace_uprobe_match_command_head(struct trace_uprobe *tu,
+                                           int argc, const char **argv)
+{
+       char buf[MAX_ARGSTR_LEN + 1];
+       int len;
+
+       if (!argc)
+               return true;
+
+       len = strlen(tu->filename);
+       if (argv[0][len] != ':' || strncmp(tu->filename, argv[0], len))
+               return false;
+
+       if (tu->ref_ctr_offset == 0)
+               snprintf(buf, sizeof(buf), "0x%0*lx",
+                               (int)(sizeof(void *) * 2), tu->offset);
+       else
+               snprintf(buf, sizeof(buf), "0x%0*lx(0x%lx)",
+                               (int)(sizeof(void *) * 2), tu->offset,
+                               tu->ref_ctr_offset);
+       if (strcmp(buf, &argv[0][len + 1]))
+               return false;
+
+       argc--; argv++;
+
+       return trace_probe_match_command_args(&tu->tp, argc, argv);
+}
+
 static bool trace_uprobe_match(const char *system, const char *event,
                        int argc, const char **argv, struct dyn_event *ev)
 {
        struct trace_uprobe *tu = to_trace_uprobe(ev);
 
        return strcmp(trace_probe_name(&tu->tp), event) == 0 &&
-           (!system || strcmp(trace_probe_group_name(&tu->tp), system) == 0);
+          (!system || strcmp(trace_probe_group_name(&tu->tp), system) == 0) &&
+          trace_uprobe_match_command_head(tu, argc, argv);
 }
 
 static nokprobe_inline struct trace_uprobe *