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| author |   Alexei Starovoitov <alexei.starovoitov@gmail.com> | 2019-11-20 18:32:25 -0500 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-11-20 18:52:23 -0500 |
| commit | eb01fedc3d539f9443082aa2384c5d1ca26ed5c1 (patch) | |
| tree | e01210c8c124d22e2d77fd35c9b69c285ba840a5 /include/linux/ftrace.h | |
| parent | ftrace: Rename ftrace_graph_stub to ftrace_stub_graph (diff) | |
| download | wireguard-linux-eb01fedc3d539f9443082aa2384c5d1ca26ed5c1.tar.xz wireguard-linux-eb01fedc3d539f9443082aa2384c5d1ca26ed5c1.zip | |
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 <ast@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 6 |
1 files changed, 3 insertions, 3 deletions
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) { |