From: "Steven Rostedt (Red Hat)" <[email protected]>
The ENABLED flag needs to be cleared when a ftrace_ops is unregistered
otherwise it wont be able to be registered again.
This is only for static tracing and does not affect DYNAMIC_FTRACE at
all.
Signed-off-by: Steven Rostedt <[email protected]>
---
kernel/trace/ftrace.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index dcee546..5313c11 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4463,7 +4463,13 @@ static inline void ftrace_startup_enable(int command) { }
(ops)->flags |= FTRACE_OPS_FL_ENABLED; \
___ret; \
})
-# define ftrace_shutdown(ops, command) __unregister_ftrace_function(ops)
+# define ftrace_shutdown(ops, command) \
+ ({ \
+ int ___ret = __unregister_ftrace_function(ops); \
+ if (!___ret) \
+ (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
+ ___ret; \
+ })
# define ftrace_startup_sysctl() do { } while (0)
# define ftrace_shutdown_sysctl() do { } while (0)
--
1.8.5.3