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Commit 34078a5e authored by Abhishek Sagar's avatar Abhishek Sagar Committed by Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
parent eb9a7bf0

kernel/trace/ftrace.c

+2 −3
Original line number Diff line number Diff line
@@ -430,7 +430,7 @@ static void ftrace_replace_code(int enable) 
			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 @@ static int __ftrace_update_code(void *ignore) 
				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);



				}

			}

		}