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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-06-23 21:09:52 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-09 18:15:31 +0200 |
| commit | 11992c703a1c7d95f5d8759498d7617d4a504819 (patch) | |
| tree | fa2fff5b57493c4912c6b1f8e514fc61f4d792b5 /kernel/rcu | |
| parent | rcu: Use __this_cpu_read() instead of per_cpu_ptr() (diff) | |
| download | linux-11992c703a1c7d95f5d8759498d7617d4a504819.tar.xz linux-11992c703a1c7d95f5d8759498d7617d4a504819.zip | |
rcu: Remove CONFIG_PROVE_RCU_DELAY
The CONFIG_PROVE_RCU_DELAY Kconfig parameter doesn't appear to be very
effective at finding race conditions, so this commit removes it.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
[ paulmck: Remove definition and uses as noted by Paul Bolle. ]
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 5 | ||||
| -rw-r--r-- | kernel/rcu/update.c | 3 |
2 files changed, 0 insertions, 8 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a6c5424ffa38..1b70cb6fbe3c 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1647,11 +1647,6 @@ static int rcu_gp_init(struct rcu_state *rsp) rnp->level, rnp->grplo, rnp->grphi, rnp->qsmask); raw_spin_unlock_irq(&rnp->lock); -#ifdef CONFIG_PROVE_RCU_DELAY - if ((prandom_u32() % (rcu_num_nodes + 1)) == 0 && - system_state == SYSTEM_RUNNING) - udelay(200); -#endif /* #ifdef CONFIG_PROVE_RCU_DELAY */ cond_resched(); } diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index bc7883570530..4056d7992a6c 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -90,9 +90,6 @@ void __rcu_read_unlock(void) } else { barrier(); /* critical section before exit code. */ t->rcu_read_lock_nesting = INT_MIN; -#ifdef CONFIG_PROVE_RCU_DELAY - udelay(10); /* Make preemption more probable. */ -#endif /* #ifdef CONFIG_PROVE_RCU_DELAY */ barrier(); /* assign before ->rcu_read_unlock_special load */ if (unlikely(ACCESS_ONCE(t->rcu_read_unlock_special))) rcu_read_unlock_special(t); |