linux-kernel - [tip: core/debugobjects] debugobjects: Allow to refill the pool before SYSTEM

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Message-ID: <176425905908.498.4130513060411020638.tip-bot2@tip-bot2>
Date: Thu, 27 Nov 2025 15:57:39 -0000
From: "tip-bot2 for Sebastian Andrzej Siewior" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: core/debugobjects] debugobjects: Allow to refill the pool
 before SYSTEM_SCHEDULING

The following commit has been merged into the core/debugobjects branch of tip:

Commit-ID:     06e0ae988f6e3499785c407429953ade19c1096b
Gitweb:        https://git.kernel.org/tip/06e0ae988f6e3499785c407429953ade19c1096b
Author:        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate:    Thu, 27 Nov 2025 16:36:51 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 27 Nov 2025 16:55:34 +01:00

debugobjects: Allow to refill the pool before SYSTEM_SCHEDULING

The pool of free objects is refilled on several occasions such as object
initialisation. On PREEMPT_RT refilling is limited to preemptible
sections due to sleeping locks used by the memory allocator. The system
boots with disabled interrupts so the pool can not be refilled.

If too many objects are initialized and the pool gets empty then
debugobjects disables itself.

Refiling can also happen early in the boot with disabled interrupts as
long as the scheduler is not operational. If the scheduler can not
preempt a task then a sleeping lock can not be contended.

Allow to additionally refill the pool if the scheduler is not
operational.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://patch.msgid.link/20251127153652.291697-2-bigeasy@linutronix.de
---
 lib/debugobjects.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 7f50c44..7017e5c 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -714,7 +714,7 @@ static void debug_objects_fill_pool(void)
 	 * raw_spinlock_t are basically the same type and this lock-type
 	 * inversion works just fine.
 	 */
-	if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible()) {
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible() || system_state < SYSTEM_SCHEDULING) {
 		/*
 		 * Annotate away the spinlock_t inside raw_spinlock_t warning
 		 * by temporarily raising the wait-type to WAIT_SLEEP, matching