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llist: Add nonatomic __llist_add() and __llist_dell_all() 

We'll use these in the new, lockless kretprobes code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/159870619318.1229682.13027387548510028721.stgit@devnote2
This commit is contained in:
Peter Zijlstra 2020-08-29 22:03:13 +09:00 committed by Ingo Molnar
parent bcb53209be
commit 476c5818c3
2 changed files with 23 additions and 6 deletions
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6
drivers/gpu/drm/i915/i915_request.c
View File

@ -357,12 +357,6 @@ void i915_request_retire_upto(struct i915_request *rq)
} while (i915_request_retire(tmp) && tmp != rq);
}
static void __llist_add(struct llist_node *node, struct llist_head *head)
{
node->next = head->first;
head->first = node;
}
static struct i915_request * const *
__engine_active(struct intel_engine_cs *engine)
{

23
include/linux/llist.h
View File

@ -197,6 +197,16 @@ static inline struct llist_node *llist_next(struct llist_node *node)
extern bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head);
static inline bool __llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head)
{
new_last->next = head->first;
head->first = new_first;
return new_last->next == NULL;
}
/**
* llist_add - add a new entry
* @new: new entry to be added
@ -209,6 +219,11 @@ static inline bool llist_add(struct llist_node *new, struct llist_head *head)
return llist_add_batch(new, new, head);
}
static inline bool __llist_add(struct llist_node *new, struct llist_head *head)
{
return __llist_add_batch(new, new, head);
}
/**
* llist_del_all - delete all entries from lock-less list
* @head: the head of lock-less list to delete all entries
@ -222,6 +237,14 @@ static inline struct llist_node *llist_del_all(struct llist_head *head)
return xchg(&head->first, NULL);
}
static inline struct llist_node *__llist_del_all(struct llist_head *head)
{
struct llist_node *first = head->first;
head->first = NULL;
return first;
}
extern struct llist_node *llist_del_first(struct llist_head *head);
struct llist_node *llist_reverse_order(struct llist_node *head);