linux-kernel - [PATCH 2/2] debugobjects: Use LD_WAIT_CONFIG instead of LD_WAIT

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Message-ID: <20251127153652.291697-3-bigeasy@linutronix.de>
Date: Thu, 27 Nov 2025 16:36:52 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 2/2] debugobjects: Use LD_WAIT_CONFIG instead of LD_WAIT_SLEEP

fill_pool_map is used to suppress nesting violations caused by acquiring
a spinlock_t (from within the memory allocator) while holding a
raw_spinlock_t. The used annotation is wrong.

LD_WAIT_SLEEP is for always sleeping lock types such as mutex_t.
LD_WAIT_CONFIG is for lock type which are sleeping while spinning on
PREEMPT_RT such as spinlock_t.

Use LD_WAIT_CONFIG as override.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 lib/debugobjects.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 7017e5c8f32dd..ecf8e7f978e30 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -717,10 +717,10 @@ static void debug_objects_fill_pool(void)
 	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
+		 * by temporarily raising the wait-type to LD_WAIT_CONFIG, matching
 		 * the preemptible() condition above.
 		 */
-		static DEFINE_WAIT_OVERRIDE_MAP(fill_pool_map, LD_WAIT_SLEEP);
+		static DEFINE_WAIT_OVERRIDE_MAP(fill_pool_map, LD_WAIT_CONFIG);
 		lock_map_acquire_try(&fill_pool_map);
 		fill_pool();
 		lock_map_release(&fill_pool_map);
-- 
2.51.0