Re: [announce] [patch] Voluntary Kernel Preemption Patch

[Andrea Arcangeli]

On Sat, Jul 10, 2004 at 01:50:17AM +0200, Andrea Arcangeli wrote:
> agreed. might_sleep() just like BUG() can be defined to noop.

BTW, this reminded me a related topic that I can't recall being ever
mentioned on l-k: BUG_ON can also be optimized away. So people should be
careful not to do write this:

        BUG_ON(test_and_set_bit(p))

but to write this instead:

        if (unlikely(test_and_set_bit(p))
                BUG()

(in short the check inside a BUG_ON must be strictly read-only since
it's not guaranteed to be computed)
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