kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/include/linux/sched/mm.h
..
..
@@ -49,17 +49,6 @@
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 		__mmdrop(mm);
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 }
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-#ifdef CONFIG_PREEMPT_RT
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-extern void __mmdrop_delayed(struct rcu_head *rhp);
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-static inline void mmdrop_delayed(struct mm_struct *mm)
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-{
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-	if (atomic_dec_and_test(&mm->mm_count))
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-		call_rcu(&mm->delayed_drop, __mmdrop_delayed);
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-}
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-#else
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-# define mmdrop_delayed(mm)    mmdrop(mm)
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-#endif
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-
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 /**
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  * mmget() - Pin the address space associated with a &struct mm_struct.
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  * @mm: The address space to pin.