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Where is the unlikely subroutine defined?

I have been working in the scheduler where I see a subroutine called
'unlikely'.  I would like to know where 'unlikely' is defined source
tree.  Specifically what file.

example of usage:

    if (unlikely(reacquire_kernel_lock(current) < 0))
        goto need_resched_nonpreemptible;


thanks for you patients,

brahan

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