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rcu: Remove unused function hlist_bl_del_init_rcu() 

The function hlist_bl_del_init_rcu() is declared in rculist_bl.h,
but never used.  This commit therefore removes it.

Signed-off-by: Ethan Hansen <1ethanhansen@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
alistair/sunxi64-5.5-dsi
Ethan Hansen 2019-08-02 13:37:58 -07:00 committed by Paul E. McKenney
parent 54ecb8f702
commit 8e6af017f4
1 changed files with 0 additions and 28 deletions
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28
include/linux/rculist_bl.h
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@ -24,34 +24,6 @@ static inline struct hlist_bl_node *hlist_bl_first_rcu(struct hlist_bl_head *h)
((unsigned long)rcu_dereference_check(h->first, hlist_bl_is_locked(h)) & ~LIST_BL_LOCKMASK);
}
/**
* hlist_bl_del_init_rcu - deletes entry from hash list with re-initialization
* @n: the element to delete from the hash list.
*
* Note: hlist_bl_unhashed() on the node returns true after this. It is
* useful for RCU based read lockfree traversal if the writer side
* must know if the list entry is still hashed or already unhashed.
*
* In particular, it means that we can not poison the forward pointers
* that may still be used for walking the hash list and we can only
* zero the pprev pointer so list_unhashed() will return true after
* this.
*
* The caller must take whatever precautions are necessary (such as
* holding appropriate locks) to avoid racing with another
* list-mutation primitive, such as hlist_bl_add_head_rcu() or
* hlist_bl_del_rcu(), running on this same list. However, it is
* perfectly legal to run concurrently with the _rcu list-traversal
* primitives, such as hlist_bl_for_each_entry_rcu().
*/
static inline void hlist_bl_del_init_rcu(struct hlist_bl_node *n)
{
if (!hlist_bl_unhashed(n)) {
__hlist_bl_del(n);
n->pprev = NULL;
}
}
/**
* hlist_bl_del_rcu - deletes entry from hash list without re-initialization
* @n: the element to delete from the hash list.