Messages in this thread | | | Date | Wed, 04 Sep 2013 17:38:14 +0800 | From | Chen Gang <> | Subject | Re: [PATCH trivial] UAPI: Kbuild: add/modify comments for "uapi/Kbuild" and "uapi/linux/Kbuild" |
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On 09/04/2013 05:27 PM, Geert Uytterhoeven wrote: > On Wed, Sep 4, 2013 at 11:13 AM, Chen Gang <gang.chen@asianux.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/, ... >
Oh, sorry, I misunderstand your original mail contents.
> 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. >
At least for me, that sounds reasonable.
Hmm... when some members need add a new Userspace API. I guess:
if it is related with one of existent "uapi/*" sub-directory (except "uapi/linux"), they need put the file(or directory) under the related "uapi/*",
if can not find existent "uapi/*" sub-directory, they need put the file(or directory) under "uapi/linux/*".
Does it sound reasonable ?
Thanks.
> Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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 > >
-- Chen Gang
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