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    SubjectRe: [PATCH RFC tip/core/rcu 11/11] rcu: move TREE_RCU from softirq to kthread
    On Wed, 2011-02-23 at 13:19 -0600, Christoph Lameter wrote:

    > this_cpu_inc is already percpu atomic. On x86 it is an instruction that
    > cannot be interrupted nor preempted while in progress.

    On x86, yes, but is this true for all architectures? I guess the
    fallback is implemented with local_irq_disable() which might be good
    enough for some but not for NMI usage.

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