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authorAlexei Starovoitov <alexei.starovoitov@gmail.com>2019-11-21 02:32:25 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-21 02:52:23 +0300
commiteb01fedc3d539f9443082aa2384c5d1ca26ed5c1 (patch)
treee01210c8c124d22e2d77fd35c9b69c285ba840a5 /include/linux/ftrace.h
parent46f9469247c6f4697cbbf37e4b3961120bf07f29 (diff)
downloadlinux-eb01fedc3d539f9443082aa2384c5d1ca26ed5c1.tar.xz
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.h6
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)
{