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    SubjectRe: BUGed to death
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    Jens Axboe <axboe@suse.de> writes:

    > On Tue, Apr 15 2003, Duncan Sands wrote:
    >> On Monday 14 April 2003 22:19, Martin J. Bligh wrote:
    >> > Seems all these bug checks are fairly expensive. I can get 1%
    >> > back on system time for kernel compiles by changing BUG to
    >> > "do {} while (0)" to make them all compile away. Profiles aren't
    >> > very revealing though ... seems to be within experimental error ;-(
    >>
    >> What happens if you just turn BUG_ON into "do {} while (0)"?
    >
    > If you do that, you must audit every single BUG_ON to make sure the
    > expression doesn't have any side effects.
    >
    > BUG_ON(do_the_good_stuff());

    #define BUG_ON(x) x; do the trick. With any luck the compiler will
    throw away most of the simple comparisons and whatnot.

    --
    Sean Neakums - <sneakums@zork.net>
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