linux-kernel - Re: [PATCH] posix_types.h: make _

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Date:	Tue, 24 Jul 2012 12:59:40 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Josh Boyer <jwboyer@...hat.com>
Cc:	Jeff Law <law@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] posix_types.h: make __NFDBITS match glibc definition

On Tue, Jul 24, 2012 at 12:41 PM, Josh Boyer <jwboyer@...hat.com> wrote:
>
> I'd be happy to come up with a patch that drops them, but since they're
> in a user visible header file I was concerned somebody might be using
> them explicitly from posix_types.h.  People do weird crap like not use
> glibc all the time.

Yeah, I agree that somebody could possibly use them.

But the odd thing is, we don't actually export anything *useful*. It's
not like we export the define for __FD_ISSET() etc, which would be
something somebody really wants. No, that kernel header only exports
the (unused by the kernel) building blocks for creating __FD_ISSET().

And I suspect (but it must be before even the old bitkeeper tree) that
we *used* to implement __FD_ISSET() long ago. We removed it, and
nobody used it, so nobody even noticed that we removed it - but left
some now unused stuff behind.

                      Linus
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