linux-kernel - Re: [PATCH RESEND] asm/types.h: Remove include/asm-generic/int-l64.h

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Date:	Wed, 20 Nov 2013 14:34:24 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Randy Dunlap <rdunlap@...otime.net>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] asm/types.h: Remove include/asm-generic/int-l64.h

On Wed, Nov 20, 2013 at 1:37 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Tuesday 19 November 2013, Geert Uytterhoeven wrote:
>> On Tue, Nov 19, 2013 at 1:35 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>
>> > I'm pretty sure you are right with this, but I don't remember at all
>> > what I suggested and don't understand what the problem (if any) is.
>> > Can you remind me?
>>
>> Me neither :-(
>> You said https://lkml.org/lkml/2011/8/13/109, and Al's umode_t
>> consolidation has been completed.
>>
>> I think it had to do with include/uapi/asm-generic/types.h including
>> <asm-generic/int-ll64.h>. Let's try...
>>
>> In userspace, it will include <asm-generic/int-ll64.h> from uapi to get
>> e.g. __u32.
>> In kernelspace, it will include plain <asm-generic/int-ll64.h> (to get e.g.
>> u32), which will in turn include <uapi/asm-generic/int-ll64.h> (to also
>> get e.g. __u32).
>>
>> As there's only include/uapi/asm-generic/types.h, but not
>> include/asm-generic/types.h (the individual architectures still have their
>> own asm/types.h), you cannot easily move (the contents of) int-ll64.h
>> to asm-generic/types.h for both the normal and uapi headers.
>>
>> Does this make sense?
>
> I'm pretty sure I was not talking about include/uapi/asm-generic/types.h
> there, and I still think we can just move include/asm-generic/int-ll64.h
> to include/asm-generic/types.h but leave the uapi logic in place.

The puzzle pieces are starting to fit: at that time, we still had
include/asm-generic/types.h, which got later renamed to
include/uapi/asm-generic/types.h...

> All architectures that do nothing but #include <asm-generic/int-ll64.h>
> from asm/types.h at the moment can then remove their private file and
> use the generic version, the others need to change to #include
> <asm-generic/types.h>.
>
> You can no longer #include <uapi/asm-generic/types.h> from kernel space
> after this change, since it refers to <asm-generic/int-ll64.h> which
> now only exists in user space, but that's ok because it would be a bug
> to include already (it defines the wrong types), and we don't.

I'll see what I can do...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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