linux-kernel - [PATCH AUTOSEL 6.6] sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG

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Message-Id: <20250408005408.3334851-1-sashal@kernel.org>
Date: Mon,  7 Apr 2025 20:54:07 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Oleg Nesterov <oleg@...hat.com>,
	kernel test robot <lkp@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	ojeda@...nel.org,
	aliceryhl@...gle.com,
	masahiroy@...nel.org,
	tj@...nel.org,
	akpm@...ux-foundation.org,
	mmaurer@...gle.com,
	yoann.congal@...le.fr,
	jeffxu@...omium.org,
	roman.gushchin@...ux.dev,
	axboe@...nel.dk,
	chenridong@...wei.com,
	jannh@...gle.com,
	mark.rutland@....com,
	brgerst@...il.com,
	vincent.guittot@...aro.org
Subject: [PATCH AUTOSEL 6.6] sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP

From: Oleg Nesterov <oleg@...hat.com>

[ Upstream commit 975776841e689dd8ba36df9fa72ac3eca3c2957a ]

kernel/sched/isolation.c obviously makes no sense without CONFIG_SMP, but
the Kconfig entry we have right now:

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

allows the creation of pointless .config's which cause
build failures.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20250330134955.GA7910@redhat.com

Closes: https://lore.kernel.org/oe-kbuild-all/202503260646.lrUqD3j5-lkp@intel.com/
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 init/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index 1105cb53f391a..8b630143c720f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -689,7 +689,7 @@ 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
-- 
2.39.5