Commit 265a5b7e authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt

kprobes/trace: Fix kprobe selftest for gcc 4.6

With gcc 4.6, the self test kprobe function:

 kprobe_trace_selftest_target()

is optimized such that kallsyms does not list it. The kprobes
test uses this function to insert a probe and test it. But
it will fail the test if the function is not listed in kallsyms.

Adding a __used annotation keeps the symbol in the kallsyms table.
Suggested-by: default avatarDavid Daney <ddaney@caviumnetworks.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 0aff1c0c
...@@ -1870,8 +1870,12 @@ fs_initcall(init_kprobe_trace); ...@@ -1870,8 +1870,12 @@ fs_initcall(init_kprobe_trace);
#ifdef CONFIG_FTRACE_STARTUP_TEST #ifdef CONFIG_FTRACE_STARTUP_TEST
static int kprobe_trace_selftest_target(int a1, int a2, int a3, /*
int a4, int a5, int a6) * The "__used" keeps gcc from removing the function symbol
* from the kallsyms table.
*/
static __used int kprobe_trace_selftest_target(int a1, int a2, int a3,
int a4, int a5, int a6)
{ {
return a1 + a2 + a3 + a4 + a5 + a6; return a1 + a2 + a3 + a4 + a5 + a6;
} }
......
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