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From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@lists.ozlabs.org, linux-kbuild@vger.kernel.org
Cc: linux-mips@linux-mips.org, alsa-devel@alsa-project.org,
	linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org,
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	linux-raid@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
	openrisc@lists.librecores.org,
	Nicolas Dichtel <nicolas.dichtel@6wind.com>,
	linux-metag@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, li
Subject: Re: [PATCH v2 0/7] uapi: export all headers under uapi directories
Date: Mon, 09 Jan 2017 12:33:58 +0100	[thread overview]
Message-ID: <3131144.4Ej3KFWRbz@wuerfel> (raw)
In-Reply-To: <1483695839-18660-1-git-send-email-nicolas.dichtel@6wind.com>

On Friday, January 6, 2017 10:43:52 AM CET Nicolas Dichtel wrote:
> Here is the v2 of this series. The first 5 patches are just cleanup: some
> exported headers were still under a non-uapi directory.

Since this is meant as a cleanup, I commented on this to point out a cleaner
way to do the same.

> The patch 6 was spotted by code review: there is no in-tree user of this
> functionality.
> The last patch remove the use of header-y. Now all files under an uapi
> directory are exported.

Very nice!

> asm is a bit special, most of architectures export asm/<arch>/include/uapi/asm
> only, but there is two exceptions:
>  - cris which exports arch/cris/include/uapi/arch-v[10|32];

This is interesting, though not your problem. Maybe someone who understands
cris better can comment on this: How is the decision made about which of
the arch/user.h headers gets used? I couldn't find that in the sources,
but it appears to be based on kernel compile-time settings, which is
wrong for user space header files that should be independent of the kernel
config.

>  - tile which exports arch/tile/include/uapi/arch.
> Because I don't know if the output of 'make headers_install_all' can be changed,
> I introduce subdir-y in Kbuild file. The headers_install_all target copies all
> asm/<arch>/include/uapi/asm to usr/include/asm-<arch> but
> arch/cris/include/uapi/arch-v[10|32] and arch/tile/include/uapi/arch are not
> prefixed (they are put asis in usr/include/). If it's acceptable to modify the
> output of 'make headers_install_all' to export asm headers in
> usr/include/asm-<arch>/asm, then I could remove this new subdir-y and exports
> everything under arch/<arch>/include/uapi/.

I don't know if anyone still uses "make headers_install_all", I suspect
distros these days all use "make headers_install", so it probably
doesn't matter much.

In case of cris, it should be easy enough to move all the contents of the
uapi/arch-*/*.h headers into the respective uapi/asm/*.h headers, they
only seem to be referenced from there.

For tile, I suspect that would not work as the arch/*.h headers are
apparently defined as interfaces for both user space and kernel.

> Note also that exported files for asm are a mix of files listed by:
>  - include/uapi/asm-generic/Kbuild.asm;
>  - arch/x86/include/uapi/asm/Kbuild;
>  - arch/x86/include/asm/Kbuild.
> This complicates a lot the processing (arch/x86/include/asm/Kbuild is also
> used by scripts/Makefile.asm-generic).
> 
> This series has been tested with a 'make headers_install' on x86 and a
> 'make headers_install_all'. I've checked the result of both commands.
> 
> This patch is built against linus tree. I don't know if it should be
> made against antoher tree.

The series should probably get merged through the kbuild tree, but testing
it on mainline is fine here.

	Arnd

  parent reply	other threads:[~2017-01-09 11:33 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20161203.192346.1198940437155108508.davem@davemloft.net>
2017-01-03 14:35 ` [PATCH] uapi: use wildcards to list files Nicolas Dichtel
2017-01-03 15:56   ` David Miller
2017-01-03 21:37   ` Arnd Bergmann
2017-01-04  9:03     ` Nicolas Dichtel
2017-01-06  9:43       ` [PATCH v2 0/7] uapi: export all headers under uapi directories Nicolas Dichtel
2017-01-06  9:43         ` [PATCH v2 1/7] arm: put types.h in uapi Nicolas Dichtel
2017-01-09 11:33           ` Arnd Bergmann
2017-01-09 12:00             ` Russell King - ARM Linux
2017-01-06  9:43         ` [PATCH v2 2/7] h8300: put bitsperlong.h " Nicolas Dichtel
2017-01-06  9:43         ` [PATCH v2 3/7] nios2: put setup.h " Nicolas Dichtel
2017-01-09 11:33           ` Arnd Bergmann
2017-01-06  9:43         ` [PATCH v2 4/7] x86: put msr-index.h " Nicolas Dichtel
2017-01-06 12:14           ` Borislav Petkov
2017-01-06 20:50           ` Andy Shevchenko
2017-01-06  9:43         ` [PATCH v2 5/7] Makefile.headersinst: cleanup input files Nicolas Dichtel
2017-01-06  9:43         ` [PATCH v2 6/7] Makefile.headersinst: remove destination-y option Nicolas Dichtel
2017-01-06  9:43         ` [PATCH v2 7/7] uapi: export all headers under uapi directories Nicolas Dichtel
2017-01-09 10:01           ` Daniel Vetter
     [not found]           ` <1483695839-18660-8-git-send-email-nicolas.dichtel-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
2017-01-09 12:01             ` Russell King - ARM Linux
2017-01-09 12:56           ` Christoph Hellwig
2017-01-12 15:52             ` Nicolas Dichtel
2017-01-12 16:28               ` Jan Engelhardt
2017-01-12 16:32                 ` Nicolas Dichtel
2017-01-13  1:04                   ` Jeff Epler
2017-01-11 18:14           ` [Linux-c6x-dev] " Mark Salter
2017-01-09 11:33         ` Arnd Bergmann [this message]
2017-01-11 12:42           ` [PATCH v2 0/7] " Jesper Nilsson
2017-01-13 10:46           ` [PATCH v3 0/8] " Nicolas Dichtel
2017-01-13 10:46             ` [PATCH v3 1/8] arm: put types.h in uapi Nicolas Dichtel
2017-01-13 17:06               ` Russell King - ARM Linux
2017-01-13 10:46             ` [PATCH v3 2/8] h8300: put bitsperlong.h " Nicolas Dichtel
2017-01-13 10:46             ` [PATCH v3 3/8] nios2: put setup.h " Nicolas Dichtel
2017-01-13 10:55               ` Tobias Klauser
2017-01-13 10:46             ` [PATCH v3 4/8] x86: stop exporting msr-index.h to userland Nicolas Dichtel
2017-01-13 10:46             ` [PATCH v3 5/8] Makefile.headersinst: cleanup input files Nicolas Dichtel
2017-01-13 10:46             ` [PATCH v3 6/8] Makefile.headersinst: remove destination-y option Nicolas Dichtel
2017-01-13 10:46             ` [PATCH v3 7/8] uapi: export all headers under uapi directories Nicolas Dichtel
2017-01-13 10:46             ` [PATCH v3 8/8] uapi: export all arch specifics directories Nicolas Dichtel
2017-01-13 15:36             ` (unknown) David Howells
2017-01-13 16:01               ` [PATCH v3 1/8] arm: put types.h in uapi Nicolas Dichtel
2017-01-13 16:19                 ` Russell King - ARM Linux
2017-01-13 15:43             ` (no subject) David Howells
2017-01-13 16:08               ` [PATCH v3 4/8] x86: stop exporting msr-index.h to userland Nicolas Dichtel
2017-01-13 16:38                 ` Borislav Petkov

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