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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#ifndef __TOOLS_LINUX_RCUPDATE_H
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#define __TOOLS_LINUX_RCUPDATE_H
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#include <urcu.h>
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#include <linux/compiler.h>
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#define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b))
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#define rcu_dereference_check(p, c) rcu_dereference(p)
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#define rcu_dereference_raw(p) rcu_dereference(p)
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#define rcu_dereference_protected(p, c) rcu_dereference(p)
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#define rcu_access_pointer(p) READ_ONCE(p)
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#define kfree_rcu(ptr, rcu_head) kfree(ptr) /* XXX */
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#define kvfree_rcu_mightsleep(ptr) kfree(ptr) /* XXX */
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#define RCU_INIT_POINTER(p, v) WRITE_ONCE(p, v)
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/* Has the specified rcu_head structure been handed to call_rcu()? */
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/**
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* rcu_head_init - Initialize rcu_head for rcu_head_after_call_rcu()
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* @rhp: The rcu_head structure to initialize.
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*
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* If you intend to invoke rcu_head_after_call_rcu() to test whether a
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* given rcu_head structure has already been passed to call_rcu(), then
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* you must also invoke this rcu_head_init() function on it just after
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* allocating that structure. Calls to this function must not race with
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* calls to call_rcu(), rcu_head_after_call_rcu(), or callback invocation.
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*/
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static inline void rcu_head_init(struct rcu_head *rhp)
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{
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rhp->func = (void *)~0L;
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}
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static inline bool
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rcu_head_after_call_rcu(struct rcu_head *rhp,
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void (*f)(struct rcu_head *head))
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{
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void (*func)(struct rcu_head *head) = READ_ONCE(rhp->func);
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if (func == f)
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return true;
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return false;
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}
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#endif /* __TOOLS_LINUX_RCUPDATE_H */
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