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    SubjectRe: [PATCH RFC] Simplify the Linux kernel by reducing its state space
    On Sun, 2012-04-01 at 00:33 +0800, Paul E. McKenney wrote:
    > Although there have been numerous complaints about the complexity of
    > parallel programming (especially over the past 5-10 years), the plain
    > truth is that the incremental complexity of parallel programming over
    > that of sequential programming is not as large as is commonly believed.
    > Despite that you might have heard, the mind-numbing complexity of modern
    > computer systems is not due so much to there being multiple CPUs, but
    > rather to there being any CPUs at all. In short, for the ultimate in
    > computer-system simplicity, the optimal choice is NR_CPUS=0.
    > This commit therefore limits kernel builds to zero CPUs. This change
    > has the beneficial side effect of rendering all kernel bugs harmless.
    > Furthermore, this commit enables additional beneficial changes, for
    > example, the removal of those parts of the kernel that are not needed
    > when there are zero CPUs.
    > Signed-off-by: Paul E. McKenney <>
    > Reviewed-by: Thomas Gleixner <>
    > ---

    Hmm... I believe you could go one step forward and allow negative values
    as well. Antimatter was proven to exist after all.

    Hint : nr_cpu_ids is an "int", not an "unsigned int"

    Bonus: Existing bugs become "must have" features.

    Of course there is no hurry and this can wait 365 days.

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