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rcu: Add RCU-sched flavors of get-state and cond-sync

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The get_state_synchronize_rcu() and cond_synchronize_rcu() functions
allow polling for grace-period completion, with an actual wait for a
grace period occurring only when cond_synchronize_rcu() is called too
soon after the corresponding get_state_synchronize_rcu().  However,
these functions work only for vanilla RCU.  This commit adds the
get_state_synchronize_sched() and cond_synchronize_sched(), which provide
the same capability for RCU-sched.

Reported-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2015-05-30 10:11:24 -07:00
parent f765d11307
commit 24560056de
4 changed files with 66 additions and 0 deletions
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10
include/linux/rcutiny.h
View file

@ -37,6 +37,16 @@ static inline void cond_synchronize_rcu(unsigned long oldstate)
might_sleep();
}
static inline unsigned long get_state_synchronize_sched(void)
{
return 0;
}
static inline void cond_synchronize_sched(unsigned long oldstate)
{
might_sleep();
}
static inline void rcu_barrier_bh(void)
{
wait_rcu_gp(call_rcu_bh);