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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 <ddaney@caviumnetworks.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-06-06 22:35:13 -04:00 committed by Steven Rostedt
parent 0aff1c0cef
commit 265a5b7ee3
1 changed files with 6 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
kernel/trace/trace_kprobe.c
View file

@ -1870,7 +1870,11 @@ 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, /*
* 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) int a4, int a5, int a6)
{ {
return a1 + a2 + a3 + a4 + a5 + a6; return a1 + a2 + a3 + a4 + a5 + a6;