From eb01fedc3d539f9443082aa2384c5d1ca26ed5c1 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Wed, 20 Nov 2019 18:32:25 -0500 Subject: ftrace: Return ENOTSUPP when DYNAMIC_FTRACE_WITH_DIRECT_CALLS is not configured When CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS is not set it's best to have the stub functions return ENOTSUPP instead of ENODEV, otherwise ENODEV is a valid error when ip is incorrect which is indistinguishable from ftrace not compiled in. Link: http://lkml.kernel.org/r/CAADnVQ+OzTikM9EhrfsC7NFsVYhATW1SVHxK64w3xn9qpk81pg@mail.gmail.com Signed-off-by: Alexei Starovoitov Signed-off-by: Steven Rostedt (VMware) --- include/linux/ftrace.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'include/linux/ftrace.h') diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index dfaa37e1943d..af79b0f8cdc1 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -268,16 +268,16 @@ int ftrace_modify_direct_caller(struct ftrace_func_entry *entry, # define ftrace_direct_func_count 0 static inline int register_ftrace_direct(unsigned long ip, unsigned long addr) { - return -ENODEV; + return -ENOTSUPP; } static inline int unregister_ftrace_direct(unsigned long ip, unsigned long addr) { - return -ENODEV; + return -ENOTSUPP; } static inline int modify_ftrace_direct(unsigned long ip, unsigned long old_addr, unsigned long new_addr) { - return -ENODEV; + return -ENOTSUPP; } static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr) { -- cgit v1.2.3-59-g8ed1b