Re: process 'stuck' at exit.

[Al Viro]

On Tue, Dec 10, 2013 at 03:05:46PM -0800, Linus Torvalds wrote:

> Nobody actually uses that argument any more (it goes back to the old
> i386 "let's manually verify that we have write permissions, because
> the CPU doesn't do it for us in the trap handling"), and it should
> probably be removed.

Ah...

> But you're right that it's at least misleading. I'd love to remove it
> entirely, because it's not even syntax-checked, and it's confusing.
> But that would be a humongous patch.
> 
> So these days, "access_ok()" literally just checks that the address is
> in the user address space range. And that would seem to always be
> appropriate for futexes, so why not just do it in the generic code?

So let's turn it into
#define access_ok(type, addr, size) address_ok(addr, size)

and then users can be converted at leisure.  Eventually we'll just remove
the unused macros...
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