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>
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@ -268,16 +268,16 @@ int ftrace_modify_direct_caller(struct ftrace_func_entry *entry,
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# define ftrace_direct_func_count 0
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static inline int register_ftrace_direct(unsigned long ip, unsigned long addr)
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{
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return -ENODEV;
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return -ENOTSUPP;
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}
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static inline int unregister_ftrace_direct(unsigned long ip, unsigned long addr)
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{
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return -ENODEV;
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return -ENOTSUPP;
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}
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static inline int modify_ftrace_direct(unsigned long ip,
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unsigned long old_addr, unsigned long new_addr)
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{
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return -ENODEV;
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return -ENOTSUPP;
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}
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static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr)
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{
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