It's possible, in the NULL case, that the check is faster than the
function call to the default function.
> However, if there was some compiler trickery we could employ such that
> a VFS change doesn't require source code to be touched, it would be a
> good idea. Being able to strip those method existence tests would make
> code a bit more readable and would also save a few cycles. But I don't
> see how to do it without making drivers not distributed with the
> kernel much harder to maintain.
You're describing C++ virtual functions.
-- Jamie
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