diff options
| author | Ingo Molnar <mingo@kernel.org> | 2013-04-30 10:49:04 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-04-30 10:49:04 +0200 |
| commit | fd29f424d458118f02e89596505c68a63dcb3007 (patch) | |
| tree | b52470ff7fe7a9f29260afe4a9f22a80fc900140 /include/linux | |
| parent | c1be5a5b1b355d40e6cf79cc979eb66dafa24ad1 (diff) | |
| parent | 49717cb40410fe4b563968680ff7c513967504c6 (diff) | |
Merge branch 'rcu/doc' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/urgent
Pull RCU documentation update for reducing OS jitter due to
per-CPU kthreads, from Paul McKenney.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/list_bl.h | 5 | ||||
| -rw-r--r-- | include/linux/rculist_bl.h | 2 | ||||
| -rw-r--r-- | include/linux/rcupdate.h | 1 |
3 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h index 31f9d75adc5b..2eb88556c5c5 100644 --- a/include/linux/list_bl.h +++ b/include/linux/list_bl.h @@ -125,6 +125,11 @@ static inline void hlist_bl_unlock(struct hlist_bl_head *b) __bit_spin_unlock(0, (unsigned long *)b); } +static inline bool hlist_bl_is_locked(struct hlist_bl_head *b) +{ + return bit_spin_is_locked(0, (unsigned long *)b); +} + /** * hlist_bl_for_each_entry - iterate over list of given type * @tpos: the type * to use as a loop cursor. diff --git a/include/linux/rculist_bl.h b/include/linux/rculist_bl.h index cf1244fbf3b6..4f216c59e7db 100644 --- a/include/linux/rculist_bl.h +++ b/include/linux/rculist_bl.h @@ -20,7 +20,7 @@ static inline void hlist_bl_set_first_rcu(struct hlist_bl_head *h, static inline struct hlist_bl_node *hlist_bl_first_rcu(struct hlist_bl_head *h) { return (struct hlist_bl_node *) - ((unsigned long)rcu_dereference(h->first) & ~LIST_BL_LOCKMASK); + ((unsigned long)rcu_dereference_check(h->first, hlist_bl_is_locked(h)) & ~LIST_BL_LOCKMASK); } /** diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index b758ce17b309..9ed2c9a4de45 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -80,6 +80,7 @@ extern void do_trace_rcu_torture_read(char *rcutorturename, #define UINT_CMP_LT(a, b) (UINT_MAX / 2 < (a) - (b)) #define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b)) #define ULONG_CMP_LT(a, b) (ULONG_MAX / 2 < (a) - (b)) +#define ulong2long(a) (*(long *)(&(a))) /* Exported common interfaces */ |