linux-kernel - bug: CONFIG_SCHED_MC_PRIO has undeclared dependency on CONFIG_DEBUG

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Message-ID: <4a813594-8c34-4be9-9292-e576577e1648@posteo.de>
Date: Tue, 07 Oct 2025 19:28:33 +0000
From: Andreas Kinzler <kinzler@...teo.de>
To: linux-kernel@...r.kernel.org
Subject: bug: CONFIG_SCHED_MC_PRIO has undeclared dependency on
 CONFIG_DEBUG_FS

please see https://bugzilla.kernel.org/show_bug.cgi?id=220638

https://elixir.bootlin.com/linux/v6.17.1/source/arch/x86/Kconfig#L1057 does not declare a dependency on CONFIG_DEBUG_FS. In fact CONFIG_SCHED_MC_PRIO requires CONFIG_DEBUG_FS because the function sched_set_itmt_support (https://elixir.bootlin.com/linux/v6.17.1/source/arch/x86/kernel/itmt.c#L108) creates debug fs entries and fails if CONFIG_DEBUG_FS is not set.

I found this bug because with my custom kernel CONFIG_SCHED_MC_PRIO functionality did not work because I did not enable CONFIG_DEBUG_FS. After enabling CONFIG_DEBUG_FS CONFIG_SCHED_MC_PRIO also worked.