ftrace: prevent ftrace modifications while being kprobe'd, v2
add two missing chunks for ftrace+kprobe.
Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 85e8413..0f271c4 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -502,8 +502,12 @@
continue;
/* ignore updates to this record's mcount site */
- if (get_kprobe((void *)rec->ip))
+ if (get_kprobe((void *)rec->ip)) {
+ freeze_record(rec);
continue;
+ } else {
+ unfreeze_record(rec);
+ }
failed = __ftrace_replace_code(rec, old, new, enable);
if (failed && (rec->flags & FTRACE_FL_CONVERTED)) {
@@ -740,7 +744,10 @@
ftrace_del_hash(p);
INIT_HLIST_NODE(&p->node);
hlist_add_head(&p->node, &temp_list);
+ freeze_record(p);
continue;
+ } else {
+ unfreeze_record(p);
}
/* convert record (i.e, patch mcount-call with NOP) */