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authorGeert Uytterhoeven <geert@linux-m68k.org>2018-01-02 12:13:10 +0100
committerIngo Molnar <mingo@kernel.org>2018-01-08 20:04:07 +0100
commit414a2dc138838642d28938506e31ad461648b898 (patch)
treed03ac50504339e80bf66575bacb00a33f0d5c9c6 /init
parent7729bebc619307a0233c86f8585a4bf3eadc7ce4 (diff)
downloadop-kernel-dev-414a2dc138838642d28938506e31ad461648b898.zip
op-kernel-dev-414a2dc138838642d28938506e31ad461648b898.tar.gz
sched/isolation: Make CONFIG_CPU_ISOLATION=y depend on SMP or COMPILE_TEST
On uniprocessor systems, critical and non-critical tasks cannot be isolated, as there is only a single CPU core. Hence enabling CPU isolation by default on such systems does not make much sense. Instead of changing the default for !SMP, fix this by making the feature depend on SMP, with an override for compile-testing. Note that its sole selector (NO_HZ_FULL) already depends on SMP. This decreases kernel size for a default uniprocessor kernel by ca. 1 KiB. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Nicolas Pitre <nico@linaro.org> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 2c43838c99d9d23f ("sched/isolation: Enable CONFIG_CPU_ISOLATION=y by default") Link: http://lkml.kernel.org/r/1514891590-20782-1-git-send-email-geert@linux-m68k.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 690a381..c122133 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -461,6 +461,7 @@ endmenu # "CPU/Task time and stats accounting"
config CPU_ISOLATION
bool "CPU isolation"
+ depends on SMP || COMPILE_TEST
default y
help
Make sure that CPUs running critical tasks are not disturbed by
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