diff options
| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-08-13 16:16:25 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-08-20 09:00:13 -0700 |
| commit | a3dc3fb161f9b4066c0fce22db72638af8baf83b (patch) | |
| tree | e41a30edd7e4965807b199da7637a6d6e44d4ed1 /include/linux/rcupdate.h | |
| parent | rcu: permit suppressing current grace period's CPU stall warnings (diff) | |
| download | linux-dev-a3dc3fb161f9b4066c0fce22db72638af8baf83b.tar.xz linux-dev-a3dc3fb161f9b4066c0fce22db72638af8baf83b.zip | |
rcu: repair code-duplication FIXMEs
Combine the duplicate definitions of ULONG_CMP_GE(), ULONG_CMP_LT(),
and rcu_preempt_depth() into include/linux/rcupdate.h.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index d7af96ef6fcf..325bad7bbca9 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -47,6 +47,9 @@ extern int rcutorture_runnable; /* for sysctl */ #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ +#define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b)) +#define ULONG_CMP_LT(a, b) (ULONG_MAX / 2 < (a) - (b)) + /** * struct rcu_head - callback structure for use with RCU * @next: next update requests in a list @@ -66,6 +69,18 @@ extern int sched_expedited_torture_stats(char *page); /* Internal to kernel */ extern void rcu_init(void); +#ifdef CONFIG_PREEMPT_RCU + +/* + * Defined as a macro as it is a very low level header included from + * areas that don't even know about current. This gives the rcu_read_lock() + * nesting depth, but makes sense only if CONFIG_PREEMPT_RCU -- in other + * types of kernel builds, the rcu_read_lock() nesting depth is unknowable. + */ +#define rcu_preempt_depth() (current->rcu_read_lock_nesting) + +#endif /* #ifdef CONFIG_PREEMPT_RCU */ + #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) #include <linux/rcutree.h> #elif defined(CONFIG_TINY_RCU) || defined(CONFIG_TINY_PREEMPT_RCU) |