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Commit 4a90a068 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: permit discontiguous cpu_possible_mask CPU numbering 



TREE_RCU assumes that CPU numbering is contiguous, but some users need
large holes in the numbering to better map to hardware layout.  This patch
makes TREE_RCU (and TREE_PREEMPT_RCU) tolerate large holes in the CPU
numbering.  However, NR_CPUS must still be greater than the largest
CPU number.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 4300aa64

kernel/rcutree.c

+1 −1
Original line number Diff line number Diff line
@@ -1913,7 +1913,7 @@ static void __init rcu_init_one(struct rcu_state *rsp) 


	rnp = rsp->level[NUM_RCU_LVLS - 1];

	for_each_possible_cpu(i) {

		if (i > rnp->grphi)

		while (i > rnp->grphi)

			rnp++;

		rsp->rda[i]->mynode = rnp;

		rcu_boot_init_percpu_data(i, rsp);