[4.4,v1,15/17] init: Introduce SYSTEM_SCHEDULING state

Message ID	1739170545-25011-16-git-send-email-kazuhiro3.hayashi@toshiba.co.jp
State	New
Headers	show Received: from mo-csw.securemx.jp (mo-csw1801.securemx.jp [210.130.202.135]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2EF871ADC6B; Mon, 10 Feb 2025 06:56:49 +0000 (UTC) From: Kazuhiro Hayashi <kazuhiro3.hayashi@toshiba.co.jp> To: linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, cip-dev@lists.cip-project.org Cc: bigeasy@linutronix.de, tglx@linutronix.de, rostedt@goodmis.org, linux-rt-users@vger.kernel.org, pavel@denx.de Subject: [PATCH 4.4 v1 15/17] init: Introduce SYSTEM_SCHEDULING state Date: Mon, 10 Feb 2025 15:55:43 +0900 Message-Id: <1739170545-25011-16-git-send-email-kazuhiro3.hayashi@toshiba.co.jp> In-Reply-To: <1739170545-25011-1-git-send-email-kazuhiro3.hayashi@toshiba.co.jp> References: <1739170545-25011-1-git-send-email-kazuhiro3.hayashi@toshiba.co.jp> Precedence: bulk
Series	Backport fixes that depends on SYSTEM_SCHEDULING \| expand [4.4,v1,00/17] Backport fixes that depends on SYSTEM_SCHEDULING [4.4,v1,01/17] init: Pin init task to the boot CPU, initially [4.4,v1,02/17] arm: Adjust system_state check [4.4,v1,03/17] arm64: Adjust system_state check [4.4,v1,04/17] x86/smp: Adjust system_state check [4.4,v1,05/17] metag: Adjust system_state check [4.4,v1,06/17] powerpc: Adjust system_state check [4.4,v1,07/17] ACPI: Adjust system_state check [4.4,v1,08/17] mm: Adjust system_state check [4.4,v1,09/17] cpufreq/pasemi: Adjust system_state check [4.4,v1,10/17] iommu/vt-d: Adjust system_state checks [4.4,v1,11/17] async: Adjust system_state checks [4.4,v1,12/17] extable: Adjust system_state checks [4.4,v1,13/17] printk: Adjust system_state checks [4.4,v1,14/17] mm/vmscan: Adjust system_state checks [4.4,v1,15/17] init: Introduce SYSTEM_SCHEDULING state [4.4,v1,16/17] sched/core: Enable might_sleep() and smp_processor_id() checks early [4.4,v1,17/17] mm: slub: allocate_slab() enables IRQ right after scheduler starts

Message ID

1739170545-25011-16-git-send-email-kazuhiro3.hayashi@toshiba.co.jp

State

New

Headers

From: Kazuhiro Hayashi <kazuhiro3.hayashi@toshiba.co.jp>
To: linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev,
        cip-dev@lists.cip-project.org
Cc: bigeasy@linutronix.de, tglx@linutronix.de, rostedt@goodmis.org,
        linux-rt-users@vger.kernel.org, pavel@denx.de
Subject: [PATCH 4.4 v1 15/17] init: Introduce SYSTEM_SCHEDULING state
Date: Mon, 10 Feb 2025 15:55:43 +0900
Message-Id: 
 <1739170545-25011-16-git-send-email-kazuhiro3.hayashi@toshiba.co.jp>
In-Reply-To: 
 <1739170545-25011-1-git-send-email-kazuhiro3.hayashi@toshiba.co.jp>
References: 
 <1739170545-25011-1-git-send-email-kazuhiro3.hayashi@toshiba.co.jp>
Precedence: bulk

Series

Backport fixes that depends on SYSTEM_SCHEDULING | expand

Commit Message

Kazuhiro Hayashi Feb. 10, 2025, 6:55 a.m. UTC

From: Thomas Gleixner <tglx@linutronix.de>

commit 69a78ff226fe0241ab6cb9dd961667be477e3cf7 upstream.

might_sleep() debugging and smp_processor_id() debugging should be active
right after the scheduler starts working. The init task can invoke
smp_processor_id() from preemptible context as it is pinned on the boot cpu
until sched_smp_init() removes the pinning and lets it schedule on all non
isolated cpus.

Add a new state which allows to enable those checks earlier and add it to
the xen do_poweroff() function.

No functional change.

Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170516184736.196214622@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kazuhiro Hayashi <kazuhiro3.hayashi@toshiba.co.jp>
---
 drivers/xen/manage.c   | 1 +
 include/linux/kernel.h | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index f494126aaecd..4f907fbda6c0 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -188,6 +188,7 @@  static void do_poweroff(void)
 {
 	switch (system_state) {
 	case SYSTEM_BOOTING:
+	case SYSTEM_SCHEDULING:
 		orderly_poweroff(true);
 		break;
 	case SYSTEM_RUNNING:
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d68f639f7330..d472456c6fcc 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -481,9 +481,13 @@  extern int root_mountflags;
 
 extern bool early_boot_irqs_disabled;
 
-/* Values used for system_state */
+/*
+ * Values used for system_state. Ordering of the states must not be changed
+ * as code checks for <, <=, >, >= STATE.
+ */
 extern enum system_states {
 	SYSTEM_BOOTING,
+	SYSTEM_SCHEDULING,
 	SYSTEM_RUNNING,
 	SYSTEM_HALT,
 	SYSTEM_POWER_OFF,

[4.4,v1,15/17] init: Introduce SYSTEM_SCHEDULING state

Commit Message

Patch