From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759261AbdENShU (ORCPT ); Sun, 14 May 2017 14:37:20 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:58184 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758139AbdENShR (ORCPT ); Sun, 14 May 2017 14:37:17 -0400 Message-Id: <20170514182716.347236777@linutronix.de> User-Agent: quilt/0.63-1 Date: Sun, 14 May 2017 20:27:16 +0200 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Ingo Molnar , Steven Rostedt , Mark Rutland Subject: [patch 00/18] init: Enable might_sleep() and smp_processor_id() debugging early Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We recentlty discovered a call path which takes a mutex from the low level secondary CPU bringup code and wondered why this was not caught by might_sleep(). The reason is that both debug facilities depend on system_state == SYSTEM_RUNNING, which is set after init memory is freed. That means that the SMP bootup and the builtin driver initialization is not covered by these checks at all. The patch series addresses this by adding two intermediate states. might_sleep() debugging is enabled right when scheduling starts, i.e. the boot CPU idle task schedules the first time. smp_processor_id() debugging is enabled right before SMP bringup happens. Thanks, tglx ---- arch/arm/kernel/smp.c | 3 +-- arch/metag/kernel/smp.c | 3 +-- arch/x86/kernel/smpboot.c | 2 +- b/arch/arm64/kernel/smp.c | 3 +-- b/arch/powerpc/kernel/smp.c | 2 +- drivers/acpi/pci_root.c | 2 +- drivers/base/node.c | 2 +- drivers/cpufreq/pasemi-cpufreq.c | 2 +- drivers/iommu/intel-iommu.c | 4 ++-- drivers/iommu/of_iommu.c | 2 +- drivers/xen/manage.c | 2 ++ include/linux/kernel.h | 2 ++ init/main.c | 12 ++++++++++-- kernel/async.c | 8 ++++---- kernel/extable.c | 2 +- kernel/printk/printk.c | 2 +- kernel/sched/core.c | 4 +++- lib/smp_processor_id.c | 2 +- mm/vmscan.c | 2 +- 19 files changed, 36 insertions(+), 25 deletions(-)