[PATCH] sched/core: Disable CONFIG_SCHED_CORE by default

[Ingo Molnar <mingo@kernel.org>]

* Linus Torvalds <torvalds@linux-foundation.org> wrote:

> On Sun, Jun 27, 2021 at 11:51 PM Ingo Molnar <mingo@kernel.org> wrote:
> >
> >     - Add "Core Scheduling" via CONFIG_SCHED_CORE=y,
> 
> Grr.
> 
> Why is this feature "default y"? I see no reason why anybody would
> enable it outside of cloud providers, which doesn't argue for it being
> on by default.

You are completely right, I missed this. Find below the patch to fix it - 
feel free to apply it directly, will rebase sched/urgent accordingly.

Thanks,

	Ingo

=====================>
From: Ingo Molnar <mingo@kernel.org>
Date: Mon, 28 Jun 2021 21:55:16 +0200
Subject: [PATCH] sched/core: Disable CONFIG_SCHED_CORE by default

This option adds extra overhead to the scheduler, and most users wouldn't want it.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/Kconfig.preempt | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index bd7c4147b9a8..3654a92e7e70 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -102,7 +102,6 @@ config PREEMPT_DYNAMIC
 
 config SCHED_CORE
 	bool "Core Scheduling for SMT"
-	default y
 	depends on SCHED_SMT
 	help
 	  This option permits Core Scheduling, a means of coordinated task