> I found there seems no declaring about "struct ftrace_entry".
>
> usually we use a struct we will declare its elements such as:
>
> struct usb_host_endpoint {
> Â Â Â Âstruct usb_endpoint_descriptor Âdesc;
>    Âstruct list_head        Âurb_list;
>    Âvoid              Â*hcpriv;
> ......................
> };
>
There is not an "explicit" declaration but if you look at
kernel/trace/trace.h you will find this macro:
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
struct struct_name { \
struct trace_entry ent; \
tstruct \
}
> I guess the secret should be "if_assign", but how does compiler interpret it?
>
> --
Actually in kernel/trace/trace_entries.h the macro is used to declare
the ftrace_entry
FTRACE_ENTRY(function, ftrace_entry,
TRACE_FN,
F_STRUCT(
__field( unsigned long, ip )
__field( unsigned long, parent_ip )
),
F_printk(" %lx <-- %lx", __entry->ip, __entry->parent_ip)
);
Also in this header other structures are declared in the same way for
example ftrace_graph_ent_entry and and ftrace_graph_ret_entry. If you
search for "struct ftrace_graph_ret_entry" declaration you won't find
anything either.
Best regards,
--
-----------------------------------------
Javier MartÃnez Canillas
(+34) 682 39 81 69
PhD Student in High Performance Computing
Computer Architecture and Operating System Department (CAOS)
Universitat AutÃnoma de Barcelona
Barcelona, Spain
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@xxxxxxxxxxxxxxxxx
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
