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debugobjects: Make them PREEMPT_RT aware

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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
This commit is contained in:
Thomas Gleixner
2021-08-12 17:43:26 +02:00
parent 36a21d5172
commit 4bedcc2846
1 changed files with 6 additions and 1 deletions
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5
lib/debugobjects.c
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@@ -557,6 +557,11 @@ __debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack
struct debug_obj *obj;
unsigned long flags;
/*
* 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);