[PATCH sched_ext/for-6.12-fixes] sched_ext: Fix build when !CONFIG_STACKTRACE

[Tejun Heo <tj@kernel.org>]

From 62d3726d4cd66f3e48dfe0f0401e0d74e58c2170 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Mon, 23 Sep 2024 06:45:22 -1000

a2f4b16e736d ("sched_ext: Build fix on !CONFIG_STACKTRACE[_SUPPORT]") tried
fixing build when !CONFIG_STACKTRACE but didn't so fully. Also put
stack_trace_print() and stack_trace_save() inside CONFIG_STACKTRACE to fix
build when !CONFIG_STACKTRACE.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409220642.fDW2OmWc-lkp@intel.com/
---
Applied to sched_ext/for-6.12-fixes. Thanks.

 kernel/sched/ext.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 9ee5a9a261cc..7c320dcd72d5 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -4469,8 +4469,9 @@ static void scx_ops_disable_workfn(struct kthread_work *work)
 
 		if (ei->msg[0] != '\0')
 			pr_err("sched_ext: %s: %s\n", scx_ops.name, ei->msg);
-
+#ifdef CONFIG_STACKTRACE
 		stack_trace_print(ei->bt, ei->bt_len, 2);
+#endif
 	} else {
 		pr_info("sched_ext: BPF scheduler \"%s\" disabled (%s)\n",
 			scx_ops.name, ei->reason);
@@ -4847,10 +4848,10 @@ static __printf(3, 4) void scx_ops_exit_kind(enum scx_exit_kind kind,
 		return;
 
 	ei->exit_code = exit_code;
-
+#ifdef CONFIG_STACKTRACE
 	if (kind >= SCX_EXIT_ERROR)
 		ei->bt_len = stack_trace_save(ei->bt, SCX_EXIT_BT_LEN, 1);
-
+#endif
 	va_start(args, fmt);
 	vscnprintf(ei->msg, SCX_EXIT_MSG_LEN, fmt, args);
 	va_end(args);
-- 
2.46.0