linux-kernel - Re: [PATCH trivial] UAPI: Kbuild: add/modify comments for "uapi/Kbuild" and "uapi/linux/Kbuild"

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Message-ID: <CAMuHMdWc3mtva92qDy4j6iUhQc5grHA1-5=vC4iXZoSyFxB4cw@mail.gmail.com>
Date:	Wed, 4 Sep 2013 11:27:43 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Jiri Kosina <trivial@...nel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Jones <davej@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	David Miller <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH trivial] UAPI: Kbuild: add/modify comments for
 "uapi/Kbuild" and "uapi/linux/Kbuild"

On Wed, Sep 4, 2013 at 11:13 AM, Chen Gang <gang.chen@...anux.com> wrote:
>>> Hmm... why we need "uapi/linux/" ?  (I can not find some related
>>> documents, so I have to 'guess').
>>
>> The "uapi" subdirectories are there to distinguish userspace headers from
>> kernelspace headers, and allow both to live in the kernel source tree.
>>
>> When running "make headers_install", the (processed) headers in the
>> various "uapi" subdirectories are copied to /usr/include.
>> Hence "uapi/linux/foo.h" becomes <linux/foo.h> in userspace.
>> In userspace there are no "uapi" subdirectories anymore.
>>
>
> Yeah, so why need another "uapi/*" excluding "uapi/linux" ?
>
> Are they also truly still "Userspace API" but which need not distinguish
> ? (at least, it seems that idea is not quite good).
>
> Hmm... maybe the "uapi/*" except "uapi/linux" are also installed? Is it
> for compatible (originally they are here, and now we have to follow, it
> is no reason to change if not find related critical issues)?

All uapi files are installed, a.o. /usr/include/scsi/, /usr/include/video/, ...

Historically, everything under "include" in the kernel source tree was
installed in /usr/include/, after (semi)manual cleanup.
Since the uapi split, everything is handled automatically.
Because of compatibility reasons (do not break userspace), paths had to
stay the same.

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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