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    Subject[PATCH tip/core/rcu 16/48] rcu: permit discontiguous cpu_possible_mask CPU numbering
    Date
    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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    kernel/rcutree.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/kernel/rcutree.c b/kernel/rcutree.c
    index f391886..c60fd74 100644
    --- a/kernel/rcutree.c
    +++ b/kernel/rcutree.c
    @@ -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);
    --
    1.7.0


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