From 4bedcc28469a24fe481a8a31b3584e6070457ddb Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 12 Aug 2021 17:43:26 +0200
Subject: [PATCH] debugobjects: Make them PREEMPT_RT aware
Git-commit: 4bedcc28469a24fe481a8a31b3584e6070457ddb
Patch-mainline: v5.15-rc1
References: bsc#1189998
On PREEMPT_RT enabled kernels it is not possible to refill the object pool
from atomic context (preemption or interrupts disabled) as the allocator
might acquire 'sleeping' spinlocks.
Guard the invocation of fill_pool() accordingly.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/87sfzehdnl.ffs@tglx
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
lib/debugobjects.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 9e14ae02306b..6946f8e204e3 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -557,7 +557,12 @@ __debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack
struct debug_obj *obj;
unsigned long flags;
- fill_pool();
+ /*
+ * On RT enabled kernels the pool refill must happen in preemptible
+ * context:
+ */
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible())
+ fill_pool();
db = get_bucket((unsigned long) addr);
--
2.26.2