Re: More on bigger kdev_t

Alan Cox (alan@lxorguk.ukuu.org.uk)
Sun, 10 Oct 1999 19:08:19 +0100 (BST)

> > The kernel makes quite heavy use of kdev_t. That means carrying around
> > expensive to handle multi-register objects is right out
>
> ... so that would mean we should use a pointer to the structure
> instead of directly passing the structure.

That means a pointer dereference and a potential cache miss every time.

> I just don't want to see us have to transition userland twice.

Userland is irrelevant, userland right now has a totally different idea of
dev_t than kernel land.

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