How do you write an argument-less kernel tracepoint? I tried:
TRACE_EVENT(hello_nil,
TP_PROTO(),
TP_ARGS(),
...
);
and
TRACE_EVENT_NOARGS(hello_nil,
// TP_PROTO(int x),
// TP_ARGS(x),
...
);
Without success.
A payload-less tracepoint is possible, but causes a couple of warnings:
make[1]: entrant dans le répertoire « /usr/src/linux-headers-3.2.0-53-virtual »
CC [M] /home/daniel/Documents/mymodule/hello.o
In file included from include/trace/ftrace.h:356:0,
from include/trace/define_trace.h:86,
from include/trace/events/hello.h:151,
from /home/daniel/Documents/mymodule/hello.c:5:
include/trace/events/hello.h: In function 'ftrace_define_fields_hello_nil':
include/trace/events/hello.h:130:1: attention : unused variable 'field'
[-Wunused-variable]
include/trace/events/hello.h:130:1: attention : 'ret' is used uninitialized in
this function [-Wuninitialized]
Building modules, stage 2.
MODPOST 1 modules
LD [M] /home/daniel/Documents/mymodule/hello.ko
make[1]: quittant le répertoire « /usr/src/linux-headers-3.2.0-53-virtual »
Is it possible to get rid of the warnings?
Daniel U. Thibault
Protection des systèmes et contremesures (PSC) | Systems Protection &
Countermeasures (SPC)
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Security (MCCS)
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