Commit a66ae8ae authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Convert rcu_gpnum_ovf() to ->gp_seq 



This commit converts rcu_gpnum_ovf() to use ->gp_seq instead of ->gpnum.
Same size unsigned long, so same approach.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 67e14c1e

kernel/rcu/tree.c

+3 −2
Original line number Diff line number Diff line
@@ -1089,14 +1089,15 @@ static int rcu_is_cpu_rrupt_from_idle(void) 
/*

 * We are reporting a quiescent state on behalf of some other CPU, so

 * it is our responsibility to check for and handle potential overflow

 * of the rcu_node ->gpnum counter with respect to the rcu_data counters.

 * of the rcu_node ->gp_seq counter with respect to the rcu_data counters.

 * After all, the CPU might be in deep idle state, and thus executing no

 * code whatsoever.

 */

static void rcu_gpnum_ovf(struct rcu_node *rnp, struct rcu_data *rdp)

{

	raw_lockdep_assert_held_rcu_node(rnp);

	if (ULONG_CMP_LT(READ_ONCE(rdp->gpnum) + ULONG_MAX / 4, rnp->gpnum))

	if (ULONG_CMP_LT(rcu_seq_current(&rdp->gp_seq) + ULONG_MAX / 4,

			 rnp->gp_seq))

		WRITE_ONCE(rdp->gpwrap, true);

	if (ULONG_CMP_LT(rdp->rcu_iw_gpnum + ULONG_MAX / 4, rnp->gpnum))

		rdp->rcu_iw_gpnum = rnp->gpnum + ULONG_MAX / 4;