ftrace: prevent freeing of all failed updates
Steven Rostedt wrote:
> If we unload a module and reload it, will it ever get converted again?
The intent was always to filter core kernel functions to prevent their freeing.
Here's a fix which should allow re-recording of module call-sites.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ad568c7..0118979 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -430,7 +430,7 @@
if (failed && (rec->flags & FTRACE_FL_CONVERTED)) {
rec->flags |= FTRACE_FL_FAILED;
if ((system_state == SYSTEM_BOOTING) ||
- !kernel_text_address(rec->ip)) {
+ !core_kernel_text(rec->ip)) {
ftrace_del_hash(rec);
ftrace_free_rec(rec);
}
@@ -651,10 +651,9 @@
ftrace_update_cnt++;
} else {
if ((system_state == SYSTEM_BOOTING) ||
- !kernel_text_address(p->ip)) {
+ !core_kernel_text(p->ip)) {
ftrace_del_hash(p);
ftrace_free_rec(p);
-
}
}
}