From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757023AbeAHUjU (ORCPT + 1 other); Mon, 8 Jan 2018 15:39:20 -0500 Received: from terminus.zytor.com ([65.50.211.136]:42439 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751773AbeAHUjR (ORCPT ); Mon, 8 Jan 2018 15:39:17 -0500 Date: Mon, 8 Jan 2018 12:34:52 -0800 From: tip-bot for Geert Uytterhoeven Message-ID: Cc: tglx@linutronix.de, peterz@infradead.org, nico@linaro.org, frederic@kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, torvalds@linux-foundation.org, hpa@zytor.com, geert@linux-m68k.org Reply-To: mingo@kernel.org, hpa@zytor.com, geert@linux-m68k.org, torvalds@linux-foundation.org, tglx@linutronix.de, peterz@infradead.org, linux-kernel@vger.kernel.org, frederic@kernel.org, nico@linaro.org In-Reply-To: <1514891590-20782-1-git-send-email-geert@linux-m68k.org> References: <1514891590-20782-1-git-send-email-geert@linux-m68k.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/urgent] sched/isolation: Make CONFIG_CPU_ISOLATION=y depend on SMP or COMPILE_TEST Git-Commit-ID: 414a2dc138838642d28938506e31ad461648b898 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: Commit-ID: 414a2dc138838642d28938506e31ad461648b898 Gitweb: https://git.kernel.org/tip/414a2dc138838642d28938506e31ad461648b898 Author: Geert Uytterhoeven AuthorDate: Tue, 2 Jan 2018 12:13:10 +0100 Committer: Ingo Molnar CommitDate: Mon, 8 Jan 2018 20:04:07 +0100 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 Acked-by: Nicolas Pitre Cc: Frederic Weisbecker Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner 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 --- init/Kconfig | 1 + 1 file changed, 1 insertion(+) 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