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kprobes/trace: Fix kprobe selftest for gcc 4.6

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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: David Daney <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
Steven Rostedt authored and Steven Rostedt committed 2011-06-07 14:47:36 -04:00
1 parent 0aff1c0cef
commit 265a5b7ee3
1 file changed
+6 -2
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kernel/trace/trace_kprobe.c
+6 -2
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@@ -1870,8 +1870,12 @@ fs_initcall(init_kprobe_trace);
#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;
}