Commit afacda5f authored by Vasily Gorbik's avatar Vasily Gorbik
Browse files

s390/test_unwind: verify __kretprobe_trampoline is replaced 



Reviewed-by: default avatarTobias Huschle <huschle@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 708b1376

arch/s390/lib/test_unwind.c

+8 −1
Original line number Diff line number Diff line
@@ -47,7 +47,7 @@ static void print_backtrace(char *bt) 
static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,

				unsigned long sp)

{

	int frame_count, prev_is_func2, seen_func2_func1;

	int frame_count, prev_is_func2, seen_func2_func1, seen_kretprobe_trampoline;

	const int max_frames = 128;

	struct unwind_state state;

	size_t bt_pos = 0;
@@ -63,6 +63,7 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs, 
	frame_count = 0;

	prev_is_func2 = 0;

	seen_func2_func1 = 0;

	seen_kretprobe_trampoline = 0;

	unwind_for_each_frame(&state, task, regs, sp) {

		unsigned long addr = unwind_get_return_address(&state);

		char sym[KSYM_SYMBOL_LEN];
@@ -88,6 +89,8 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs, 
		if (prev_is_func2 && str_has_prefix(sym, "unwindme_func1"))

			seen_func2_func1 = 1;

		prev_is_func2 = str_has_prefix(sym, "unwindme_func2");

		if (str_has_prefix(sym, "__kretprobe_trampoline+0x0/"))

			seen_kretprobe_trampoline = 1;

	}



	/* Check the results. */
@@ -103,6 +106,10 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs, 
		kunit_err(current_test, "Maximum number of frames exceeded\n");

		ret = -EINVAL;

	}

	if (seen_kretprobe_trampoline) {

		kunit_err(current_test, "__kretprobe_trampoline+0x0 in unwinding results\n");

		ret = -EINVAL;

	}

	if (ret || force_bt)

		print_backtrace(bt);

	kfree(bt);