linux-kernel - [PATCH] sched/isolation: forbid CONFIG_CPU_ISOLATION without CONFIG

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Message-ID: <20250330134955.GA7910@redhat.com>
Date: Sun, 30 Mar 2025 15:49:55 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: kernel test robot <lkp@...el.com>, Ingo Molnar <mingo@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>, Phil Auld <pauld@...hat.com>
Subject: [PATCH] sched/isolation: forbid CONFIG_CPU_ISOLATION without
 CONFIG_SMP

kernel/sched/isolation.c obviously makes no sense without CONFIG_SMP, but

	config CPU_ISOLATION
		bool "CPU isolation"
		depends on SMP || COMPILE_TEST

we currently have allows to create the pointless .config's which cause the
build failures.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503260646.lrUqD3j5-lkp@intel.com/
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 init/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index 681f38ee68db..ab9b0c2c3d52 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -709,7 +709,7 @@ endmenu # "CPU/Task time and stats accounting"
 
 config CPU_ISOLATION
 	bool "CPU isolation"
-	depends on SMP || COMPILE_TEST
+	depends on SMP
 	default y
 	help
 	  Make sure that CPUs running critical tasks are not disturbed by
-- 
2.25.1.362.g51ebf55