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![Sasha Levin](/assets/img/avatar_default.png)
I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
506 lines
17 KiB
C
506 lines
17 KiB
C
#ifndef _LINUX_RCULIST_H
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#define _LINUX_RCULIST_H
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#ifdef __KERNEL__
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/*
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* RCU-protected list version
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*/
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#include <linux/list.h>
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#include <linux/rcupdate.h>
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/*
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* Why is there no list_empty_rcu()? Because list_empty() serves this
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* purpose. The list_empty() function fetches the RCU-protected pointer
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* and compares it to the address of the list head, but neither dereferences
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* this pointer itself nor provides this pointer to the caller. Therefore,
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* it is not necessary to use rcu_dereference(), so that list_empty() can
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* be used anywhere you would want to use a list_empty_rcu().
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*/
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/*
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* return the ->next pointer of a list_head in an rcu safe
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* way, we must not access it directly
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*/
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#define list_next_rcu(list) (*((struct list_head __rcu **)(&(list)->next)))
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/*
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* Insert a new entry between two known consecutive entries.
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*
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* This is only for internal list manipulation where we know
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* the prev/next entries already!
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*/
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#ifndef CONFIG_DEBUG_LIST
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static inline void __list_add_rcu(struct list_head *new,
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struct list_head *prev, struct list_head *next)
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{
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new->next = next;
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new->prev = prev;
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rcu_assign_pointer(list_next_rcu(prev), new);
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next->prev = new;
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}
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#else
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extern void __list_add_rcu(struct list_head *new,
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struct list_head *prev, struct list_head *next);
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#endif
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/**
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* list_add_rcu - add a new entry to rcu-protected list
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* @new: new entry to be added
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* @head: list head to add it after
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*
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* Insert a new entry after the specified head.
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* This is good for implementing stacks.
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*
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* The caller must take whatever precautions are necessary
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* (such as holding appropriate locks) to avoid racing
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* with another list-mutation primitive, such as list_add_rcu()
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* or list_del_rcu(), running on this same list.
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* However, it is perfectly legal to run concurrently with
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* the _rcu list-traversal primitives, such as
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* list_for_each_entry_rcu().
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*/
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static inline void list_add_rcu(struct list_head *new, struct list_head *head)
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{
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__list_add_rcu(new, head, head->next);
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}
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/**
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* list_add_tail_rcu - add a new entry to rcu-protected list
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* @new: new entry to be added
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* @head: list head to add it before
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*
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* Insert a new entry before the specified head.
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* This is useful for implementing queues.
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*
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* The caller must take whatever precautions are necessary
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* (such as holding appropriate locks) to avoid racing
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* with another list-mutation primitive, such as list_add_tail_rcu()
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* or list_del_rcu(), running on this same list.
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* However, it is perfectly legal to run concurrently with
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* the _rcu list-traversal primitives, such as
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* list_for_each_entry_rcu().
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*/
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static inline void list_add_tail_rcu(struct list_head *new,
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struct list_head *head)
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{
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__list_add_rcu(new, head->prev, head);
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}
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/**
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* list_del_rcu - deletes entry from list without re-initialization
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* @entry: the element to delete from the list.
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*
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* Note: list_empty() on entry does not return true after this,
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* the entry is in an undefined state. It is useful for RCU based
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* lockfree traversal.
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*
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* In particular, it means that we can not poison the forward
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* pointers that may still be used for walking the list.
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*
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* The caller must take whatever precautions are necessary
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* (such as holding appropriate locks) to avoid racing
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* with another list-mutation primitive, such as list_del_rcu()
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* or list_add_rcu(), running on this same list.
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* However, it is perfectly legal to run concurrently with
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* the _rcu list-traversal primitives, such as
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* list_for_each_entry_rcu().
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*
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* Note that the caller is not permitted to immediately free
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* the newly deleted entry. Instead, either synchronize_rcu()
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* or call_rcu() must be used to defer freeing until an RCU
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* grace period has elapsed.
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*/
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static inline void list_del_rcu(struct list_head *entry)
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{
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__list_del_entry(entry);
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entry->prev = LIST_POISON2;
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}
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/**
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* hlist_del_init_rcu - deletes entry from hash list with re-initialization
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* @n: the element to delete from the hash list.
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*
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* Note: list_unhashed() on the node return true after this. It is
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* useful for RCU based read lockfree traversal if the writer side
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* must know if the list entry is still hashed or already unhashed.
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*
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* In particular, it means that we can not poison the forward pointers
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* that may still be used for walking the hash list and we can only
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* zero the pprev pointer so list_unhashed() will return true after
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* this.
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*
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* The caller must take whatever precautions are necessary (such as
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* holding appropriate locks) to avoid racing with another
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* list-mutation primitive, such as hlist_add_head_rcu() or
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* hlist_del_rcu(), running on this same list. However, it is
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* perfectly legal to run concurrently with the _rcu list-traversal
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* primitives, such as hlist_for_each_entry_rcu().
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*/
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static inline void hlist_del_init_rcu(struct hlist_node *n)
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{
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if (!hlist_unhashed(n)) {
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__hlist_del(n);
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n->pprev = NULL;
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}
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}
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/**
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* list_replace_rcu - replace old entry by new one
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* @old : the element to be replaced
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* @new : the new element to insert
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*
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* The @old entry will be replaced with the @new entry atomically.
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* Note: @old should not be empty.
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*/
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static inline void list_replace_rcu(struct list_head *old,
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struct list_head *new)
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{
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new->next = old->next;
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new->prev = old->prev;
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rcu_assign_pointer(list_next_rcu(new->prev), new);
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new->next->prev = new;
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old->prev = LIST_POISON2;
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}
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/**
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* list_splice_init_rcu - splice an RCU-protected list into an existing list.
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* @list: the RCU-protected list to splice
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* @head: the place in the list to splice the first list into
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* @sync: function to sync: synchronize_rcu(), synchronize_sched(), ...
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*
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* @head can be RCU-read traversed concurrently with this function.
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*
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* Note that this function blocks.
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*
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* Important note: the caller must take whatever action is necessary to
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* prevent any other updates to @head. In principle, it is possible
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* to modify the list as soon as sync() begins execution.
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* If this sort of thing becomes necessary, an alternative version
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* based on call_rcu() could be created. But only if -really-
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* needed -- there is no shortage of RCU API members.
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*/
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static inline void list_splice_init_rcu(struct list_head *list,
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struct list_head *head,
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void (*sync)(void))
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{
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struct list_head *first = list->next;
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struct list_head *last = list->prev;
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struct list_head *at = head->next;
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if (list_empty(list))
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return;
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/* "first" and "last" tracking list, so initialize it. */
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INIT_LIST_HEAD(list);
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/*
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* At this point, the list body still points to the source list.
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* Wait for any readers to finish using the list before splicing
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* the list body into the new list. Any new readers will see
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* an empty list.
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*/
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sync();
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/*
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* Readers are finished with the source list, so perform splice.
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* The order is important if the new list is global and accessible
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* to concurrent RCU readers. Note that RCU readers are not
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* permitted to traverse the prev pointers without excluding
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* this function.
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*/
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last->next = at;
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rcu_assign_pointer(list_next_rcu(head), first);
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first->prev = head;
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at->prev = last;
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}
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/**
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* list_entry_rcu - get the struct for this entry
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* @ptr: the &struct list_head pointer.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*
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* This primitive may safely run concurrently with the _rcu list-mutation
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* primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
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*/
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#define list_entry_rcu(ptr, type, member) \
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({typeof (*ptr) __rcu *__ptr = (typeof (*ptr) __rcu __force *)ptr; \
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container_of((typeof(ptr))rcu_dereference_raw(__ptr), type, member); \
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})
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/**
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* Where are list_empty_rcu() and list_first_entry_rcu()?
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*
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* Implementing those functions following their counterparts list_empty() and
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* list_first_entry() is not advisable because they lead to subtle race
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* conditions as the following snippet shows:
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*
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* if (!list_empty_rcu(mylist)) {
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* struct foo *bar = list_first_entry_rcu(mylist, struct foo, list_member);
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* do_something(bar);
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* }
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*
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* The list may not be empty when list_empty_rcu checks it, but it may be when
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* list_first_entry_rcu rereads the ->next pointer.
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*
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* Rereading the ->next pointer is not a problem for list_empty() and
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* list_first_entry() because they would be protected by a lock that blocks
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* writers.
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*
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* See list_first_or_null_rcu for an alternative.
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*/
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/**
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* list_first_or_null_rcu - get the first element from a list
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* @ptr: the list head to take the element from.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*
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* Note that if the list is empty, it returns NULL.
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*
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* This primitive may safely run concurrently with the _rcu list-mutation
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* primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
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*/
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#define list_first_or_null_rcu(ptr, type, member) \
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({struct list_head *__ptr = (ptr); \
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struct list_head __rcu *__next = list_next_rcu(__ptr); \
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likely(__ptr != __next) ? container_of(__next, type, member) : NULL; \
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})
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/**
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* list_for_each_entry_rcu - iterate over rcu list of given type
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* This list-traversal primitive may safely run concurrently with
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* the _rcu list-mutation primitives such as list_add_rcu()
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* as long as the traversal is guarded by rcu_read_lock().
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*/
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#define list_for_each_entry_rcu(pos, head, member) \
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for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \
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&pos->member != (head); \
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pos = list_entry_rcu(pos->member.next, typeof(*pos), member))
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/**
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* list_for_each_entry_continue_rcu - continue iteration over list of given type
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* @pos: the type * to use as a loop cursor.
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* @head: the head for your list.
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* @member: the name of the list_struct within the struct.
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*
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* Continue to iterate over list of given type, continuing after
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* the current position.
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*/
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#define list_for_each_entry_continue_rcu(pos, head, member) \
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for (pos = list_entry_rcu(pos->member.next, typeof(*pos), member); \
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&pos->member != (head); \
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pos = list_entry_rcu(pos->member.next, typeof(*pos), member))
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/**
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* hlist_del_rcu - deletes entry from hash list without re-initialization
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* @n: the element to delete from the hash list.
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*
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* Note: list_unhashed() on entry does not return true after this,
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* the entry is in an undefined state. It is useful for RCU based
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* lockfree traversal.
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*
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* In particular, it means that we can not poison the forward
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* pointers that may still be used for walking the hash list.
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*
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* The caller must take whatever precautions are necessary
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* (such as holding appropriate locks) to avoid racing
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* with another list-mutation primitive, such as hlist_add_head_rcu()
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* or hlist_del_rcu(), running on this same list.
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* However, it is perfectly legal to run concurrently with
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* the _rcu list-traversal primitives, such as
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* hlist_for_each_entry().
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*/
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static inline void hlist_del_rcu(struct hlist_node *n)
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{
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__hlist_del(n);
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n->pprev = LIST_POISON2;
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}
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/**
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* hlist_replace_rcu - replace old entry by new one
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* @old : the element to be replaced
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* @new : the new element to insert
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*
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* The @old entry will be replaced with the @new entry atomically.
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*/
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static inline void hlist_replace_rcu(struct hlist_node *old,
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struct hlist_node *new)
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{
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struct hlist_node *next = old->next;
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new->next = next;
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new->pprev = old->pprev;
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rcu_assign_pointer(*(struct hlist_node __rcu **)new->pprev, new);
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if (next)
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new->next->pprev = &new->next;
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old->pprev = LIST_POISON2;
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}
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/*
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* return the first or the next element in an RCU protected hlist
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*/
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#define hlist_first_rcu(head) (*((struct hlist_node __rcu **)(&(head)->first)))
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#define hlist_next_rcu(node) (*((struct hlist_node __rcu **)(&(node)->next)))
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#define hlist_pprev_rcu(node) (*((struct hlist_node __rcu **)((node)->pprev)))
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/**
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* hlist_add_head_rcu
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* @n: the element to add to the hash list.
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* @h: the list to add to.
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*
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* Description:
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* Adds the specified element to the specified hlist,
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* while permitting racing traversals.
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*
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* The caller must take whatever precautions are necessary
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* (such as holding appropriate locks) to avoid racing
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* with another list-mutation primitive, such as hlist_add_head_rcu()
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* or hlist_del_rcu(), running on this same list.
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* However, it is perfectly legal to run concurrently with
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* the _rcu list-traversal primitives, such as
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* hlist_for_each_entry_rcu(), used to prevent memory-consistency
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* problems on Alpha CPUs. Regardless of the type of CPU, the
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* list-traversal primitive must be guarded by rcu_read_lock().
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*/
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static inline void hlist_add_head_rcu(struct hlist_node *n,
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struct hlist_head *h)
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{
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struct hlist_node *first = h->first;
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n->next = first;
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n->pprev = &h->first;
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rcu_assign_pointer(hlist_first_rcu(h), n);
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if (first)
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first->pprev = &n->next;
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}
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/**
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* hlist_add_before_rcu
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* @n: the new element to add to the hash list.
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* @next: the existing element to add the new element before.
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*
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* Description:
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* Adds the specified element to the specified hlist
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* before the specified node while permitting racing traversals.
|
|
*
|
|
* The caller must take whatever precautions are necessary
|
|
* (such as holding appropriate locks) to avoid racing
|
|
* with another list-mutation primitive, such as hlist_add_head_rcu()
|
|
* or hlist_del_rcu(), running on this same list.
|
|
* However, it is perfectly legal to run concurrently with
|
|
* the _rcu list-traversal primitives, such as
|
|
* hlist_for_each_entry_rcu(), used to prevent memory-consistency
|
|
* problems on Alpha CPUs.
|
|
*/
|
|
static inline void hlist_add_before_rcu(struct hlist_node *n,
|
|
struct hlist_node *next)
|
|
{
|
|
n->pprev = next->pprev;
|
|
n->next = next;
|
|
rcu_assign_pointer(hlist_pprev_rcu(n), n);
|
|
next->pprev = &n->next;
|
|
}
|
|
|
|
/**
|
|
* hlist_add_after_rcu
|
|
* @prev: the existing element to add the new element after.
|
|
* @n: the new element to add to the hash list.
|
|
*
|
|
* Description:
|
|
* Adds the specified element to the specified hlist
|
|
* after the specified node while permitting racing traversals.
|
|
*
|
|
* The caller must take whatever precautions are necessary
|
|
* (such as holding appropriate locks) to avoid racing
|
|
* with another list-mutation primitive, such as hlist_add_head_rcu()
|
|
* or hlist_del_rcu(), running on this same list.
|
|
* However, it is perfectly legal to run concurrently with
|
|
* the _rcu list-traversal primitives, such as
|
|
* hlist_for_each_entry_rcu(), used to prevent memory-consistency
|
|
* problems on Alpha CPUs.
|
|
*/
|
|
static inline void hlist_add_after_rcu(struct hlist_node *prev,
|
|
struct hlist_node *n)
|
|
{
|
|
n->next = prev->next;
|
|
n->pprev = &prev->next;
|
|
rcu_assign_pointer(hlist_next_rcu(prev), n);
|
|
if (n->next)
|
|
n->next->pprev = &n->next;
|
|
}
|
|
|
|
#define __hlist_for_each_rcu(pos, head) \
|
|
for (pos = rcu_dereference(hlist_first_rcu(head)); \
|
|
pos; \
|
|
pos = rcu_dereference(hlist_next_rcu(pos)))
|
|
|
|
/**
|
|
* hlist_for_each_entry_rcu - iterate over rcu list of given type
|
|
* @pos: the type * to use as a loop cursor.
|
|
* @head: the head for your list.
|
|
* @member: the name of the hlist_node within the struct.
|
|
*
|
|
* This list-traversal primitive may safely run concurrently with
|
|
* the _rcu list-mutation primitives such as hlist_add_head_rcu()
|
|
* as long as the traversal is guarded by rcu_read_lock().
|
|
*/
|
|
#define hlist_for_each_entry_rcu(pos, head, member) \
|
|
for (pos = hlist_entry_safe (rcu_dereference_raw(hlist_first_rcu(head)),\
|
|
typeof(*(pos)), member); \
|
|
pos; \
|
|
pos = hlist_entry_safe(rcu_dereference_raw(hlist_next_rcu(\
|
|
&(pos)->member)), typeof(*(pos)), member))
|
|
|
|
/**
|
|
* hlist_for_each_entry_rcu_bh - iterate over rcu list of given type
|
|
* @pos: the type * to use as a loop cursor.
|
|
* @head: the head for your list.
|
|
* @member: the name of the hlist_node within the struct.
|
|
*
|
|
* This list-traversal primitive may safely run concurrently with
|
|
* the _rcu list-mutation primitives such as hlist_add_head_rcu()
|
|
* as long as the traversal is guarded by rcu_read_lock().
|
|
*/
|
|
#define hlist_for_each_entry_rcu_bh(pos, head, member) \
|
|
for (pos = hlist_entry_safe(rcu_dereference_bh(hlist_first_rcu(head)),\
|
|
typeof(*(pos)), member); \
|
|
pos; \
|
|
pos = hlist_entry_safe(rcu_dereference_bh(hlist_next_rcu(\
|
|
&(pos)->member)), typeof(*(pos)), member))
|
|
|
|
/**
|
|
* hlist_for_each_entry_continue_rcu - iterate over a hlist continuing after current point
|
|
* @pos: the type * to use as a loop cursor.
|
|
* @member: the name of the hlist_node within the struct.
|
|
*/
|
|
#define hlist_for_each_entry_continue_rcu(pos, member) \
|
|
for (pos = hlist_entry_safe(rcu_dereference((pos)->member.next),\
|
|
typeof(*(pos)), member); \
|
|
pos; \
|
|
pos = hlist_entry_safe(rcu_dereference((pos)->member.next),\
|
|
typeof(*(pos)), member))
|
|
|
|
/**
|
|
* hlist_for_each_entry_continue_rcu_bh - iterate over a hlist continuing after current point
|
|
* @pos: the type * to use as a loop cursor.
|
|
* @member: the name of the hlist_node within the struct.
|
|
*/
|
|
#define hlist_for_each_entry_continue_rcu_bh(pos, member) \
|
|
for (pos = hlist_entry_safe(rcu_dereference_bh((pos)->member.next),\
|
|
typeof(*(pos)), member); \
|
|
pos; \
|
|
pos = hlist_entry_safe(rcu_dereference_bh((pos)->member.next),\
|
|
typeof(*(pos)), member))
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif
|