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rcutorture: Correctly handle grace-period sequence wrap

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The new ->gq_seq grace-period sequence numbers must be shifted down,
which give artifacts when these numbers wrap.  This commit therefore
enables rcutorture and rcuperf to handle grace-period sequence numbers
even if they do wrap.  It does this by allowing a special subtraction
function to be specified, and this function subtracts before shifting.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-05-15 15:24:41 -07:00
parent 2e3e5e5501
commit d72193123c
4 changed files with 41 additions and 11 deletions
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6
kernel/rcu/tree.c
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@@ -532,7 +532,7 @@ static int rcu_pending(void);
*/
unsigned long rcu_get_gp_seq(void)
{
return rcu_seq_ctr(READ_ONCE(rcu_state_p->gp_seq));
return READ_ONCE(rcu_state_p->gp_seq);
}
EXPORT_SYMBOL_GPL(rcu_get_gp_seq);
@@ -541,7 +541,7 @@ EXPORT_SYMBOL_GPL(rcu_get_gp_seq);
*/
unsigned long rcu_sched_get_gp_seq(void)
{
return rcu_seq_ctr(READ_ONCE(rcu_sched_state.gp_seq));
return READ_ONCE(rcu_sched_state.gp_seq);
}
EXPORT_SYMBOL_GPL(rcu_sched_get_gp_seq);
@@ -550,7 +550,7 @@ EXPORT_SYMBOL_GPL(rcu_sched_get_gp_seq);
*/
unsigned long rcu_bh_get_gp_seq(void)
{
return rcu_seq_ctr(READ_ONCE(rcu_bh_state.gp_seq));
return READ_ONCE(rcu_bh_state.gp_seq);
}
EXPORT_SYMBOL_GPL(rcu_bh_get_gp_seq);