diff options
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r-- | include/linux/rcupdate.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h new file mode 100644 index 00000000..f5260270 --- /dev/null +++ b/include/linux/rcupdate.h @@ -0,0 +1,48 @@ +#ifndef __TOOLS_LINUX_RCUPDATE_H +#define __TOOLS_LINUX_RCUPDATE_H + +#include <urcu.h> +#include <linux/compiler.h> + +#define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b)) + +#define rcu_dereference_check(p, c) rcu_dereference(p) +#define rcu_dereference_raw(p) rcu_dereference(p) +#define rcu_dereference_protected(p, c) rcu_dereference(p) +#define rcu_access_pointer(p) READ_ONCE(p) + +#define kfree_rcu(ptr, rcu_head) kfree(ptr) /* XXX */ +#define kfree_rcu_mightsleep(ptr) kfree(ptr) /* XXX */ +#define kvfree_rcu_mightsleep(ptr) kfree(ptr) /* XXX */ + +#define RCU_INIT_POINTER(p, v) WRITE_ONCE(p, v) + +/* Has the specified rcu_head structure been handed to call_rcu()? */ + +/** + * rcu_head_init - Initialize rcu_head for rcu_head_after_call_rcu() + * @rhp: The rcu_head structure to initialize. + * + * If you intend to invoke rcu_head_after_call_rcu() to test whether a + * given rcu_head structure has already been passed to call_rcu(), then + * you must also invoke this rcu_head_init() function on it just after + * allocating that structure. Calls to this function must not race with + * calls to call_rcu(), rcu_head_after_call_rcu(), or callback invocation. + */ +static inline void rcu_head_init(struct rcu_head *rhp) +{ + rhp->func = (void *)~0L; +} + +static inline bool +rcu_head_after_call_rcu(struct rcu_head *rhp, + void (*f)(struct rcu_head *head)) +{ + void (*func)(struct rcu_head *head) = READ_ONCE(rhp->func); + + if (func == f) + return true; + return false; +} + +#endif /* __TOOLS_LINUX_RCUPDATE_H */ |