linux-kernel - [PATCH] sched_ext: add CONFIG_DEBUG_INFO

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Date: Thu, 27 Jun 2024 20:45:22 +0200
From: Andrea Righi <andrea.righi@...onical.com>
To: Tejun Heo <tj@...nel.org>,
	David Vernet <void@...ifault.com>
Cc: linux-kernel@...r.kernel.org,
	Andrea Righi <andrea.righi@...onical.com>
Subject: [PATCH] sched_ext: add CONFIG_DEBUG_INFO_BTF dependency

Without BTF, attempting to load any sched_ext scheduler will result in
an error like the following:

  libbpf: kernel BTF is missing at '/sys/kernel/btf/vmlinux', was CONFIG_DEBUG_INFO_BTF enabled?

This makes sched_ext pretty much unusable, so explicitly depend on
CONFIG_DEBUG_INFO_BTF to prevent these issues.

Signed-off-by: Andrea Righi <andrea.righi@...onical.com>
---
 kernel/Kconfig.preempt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index f035c87d02f1..f3d140c3acc1 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -135,7 +135,7 @@ config SCHED_CORE
 
 config SCHED_CLASS_EXT
 	bool "Extensible Scheduling Class"
-	depends on BPF_SYSCALL && BPF_JIT
+	depends on BPF_SYSCALL && BPF_JIT && DEBUG_INFO_BTF
 	help
 	  This option enables a new scheduler class sched_ext (SCX), which
 	  allows scheduling policies to be implemented as BPF programs to
-- 
2.43.0