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    SubjectRe: [PATCH #2] console lock grabbed too early in printk...
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    > is not held (which is the only case that matters, because otherwise,
    > access would block on the console_lock currently), we have the following
    > (for the x86 at least, the others are similar):
    >
    > spin_lock:
    > "xchgb %b0,%1"
    > "cmp $1, ..."
    > "jz ..."
    >
    > Note that the jump is not taken, so it is one cycle.

    The xchgb is a locked bus access so takes an awful lot longer, especially on
    earlier cpus


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