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From: Masahiro Yamada <masahiroy@kernel.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH 2/8] kbuild: prevent exported headers from including <stdlib.h>, <stdbool.h>
Date: Tue, 5 Apr 2022 10:12:17 +0900	[thread overview]
Message-ID: <CAK7LNAQDD4u5acyG7m4mziz-nz3D2u+ukdZZB+jZah_3JZFMTQ@mail.gmail.com> (raw)
In-Reply-To: <YkssI2uDHRq41zjw@google.com>

On Tue, Apr 5, 2022 at 2:34 AM Nick Desaulniers <ndesaulniers@google.com> wrote:
>
> On Mon, Apr 04, 2022 at 12:41:54AM -0700, Christoph Hellwig wrote:
> > On Mon, Apr 04, 2022 at 03:19:42PM +0900, Masahiro Yamada wrote:
> > > If we can make kernel headers self-contained (that is, none of exported
> > > kernel headers includes system headers), we will be able to add the
> > > -nostdinc flag, but that is much far from where we stand now.
>
> This is something I'd like to see done. IMO, the kernel headers should
> be the independent variable of which the libc is the dependendent
> variable.
>
> Android's libc, Bionic, is making use of the UAPI headers. They are
> doing some rewriting of UAPI headers, but I'd like to see what needs to
> be upstreamed from there. I just noticed
> include/uapi/linux/libc-compat.h, which seems like a good place for such
> compat related issues.
>
> In particular, having UAPI_HEADER_TESTS depend on CC_CAN_LINK is
> something I think we can works towards removing. The header tests
> themselves don't link; they force a dependency on a prebuilt libc
> sysroot, and they only need the headers from the sysroot because of this
> existing circular dependency between kernel headers and libc headers.
>
> I'd be happy to be explicitly cc'ed on changes like this series, going
> forward. Masahiro, if there's parts you'd like me to help with besides
> just code review, please let me know how I can help.


I wanted to make uapi headers as self-contained as possible,
but I did not see much progress.

I just fixed up some low-hanging fruits, but there are still
many remaining issues.

Thank you very much for your contribution:
https://lore.kernel.org/all/20220404175448.46200-1-ndesaulniers@google.com/

If you eliminate other issues, that would be appreciated.


> >
> > What is still missing for that?



-- 
Best Regards
Masahiro Yamada

  reply	other threads:[~2022-04-05  2:20 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-04  6:19 [PATCH 0/8] UAPI: make more exported headers self-contained, and put them into test coverage Masahiro Yamada
2022-04-04  6:19 ` [PATCH 1/8] agpgart.h: do not include <stdlib.h> from exported header Masahiro Yamada
2022-04-04  7:40   ` Christoph Hellwig
2022-04-04 17:27   ` Nick Desaulniers
2022-04-04  6:19 ` [PATCH 2/8] kbuild: prevent exported headers from including <stdlib.h>, <stdbool.h> Masahiro Yamada
2022-04-04  7:41   ` Christoph Hellwig
2022-04-04  8:01     ` Arnd Bergmann
2022-04-04  8:03     ` Masahiro Yamada
2022-04-04 17:34     ` Nick Desaulniers
2022-04-05  1:12       ` Masahiro Yamada [this message]
2022-04-04  6:19 ` [PATCH 3/8] riscv: add linux/bpf_perf_event.h to UAPI compile-test coverage Masahiro Yamada
2022-04-04  7:41   ` Christoph Hellwig
2022-04-04  6:19 ` [PATCH 4/8] mips: add asm/stat.h " Masahiro Yamada
2022-04-04  7:42   ` Christoph Hellwig
2022-04-04  6:19 ` [PATCH 5/8] powerpc: " Masahiro Yamada
2022-04-04  7:42   ` Christoph Hellwig
2022-04-04  6:19 ` [PATCH 6/8] sparc: " Masahiro Yamada
2022-04-04  7:43   ` Christoph Hellwig
2022-04-04  6:19 ` [PATCH 7/8] posix_types.h: add __kernel_uintptr_t to UAPI posix_types.h Masahiro Yamada
2022-04-04 11:30   ` kernel test robot
2022-04-04 11:51     ` Masahiro Yamada
2022-04-04 12:02       ` Masahiro Yamada
2022-04-04 11:51   ` kernel test robot
2022-04-04 13:04   ` kernel test robot
2022-04-04  6:19 ` [PATCH 8/8] virtio_ring.h: do not include <stdint.h> from exported header Masahiro Yamada
2022-04-04  7:44   ` Christoph Hellwig
2022-04-04  7:58     ` Masahiro Yamada
2022-04-04  8:04     ` Arnd Bergmann
2022-04-05  5:35       ` Christoph Hellwig
2022-04-05  6:29         ` Arnd Bergmann
2022-04-05  7:01           ` Christoph Hellwig
2022-04-05 11:55             ` Michael S. Tsirkin
2022-04-05 11:57           ` Michael S. Tsirkin
2022-04-05 11:59     ` Michael S. Tsirkin
2022-04-05 11:57   ` Michael S. Tsirkin
2022-04-04  7:34 ` [PATCH 0/8] UAPI: make more exported headers self-contained, and put them into test coverage Arnd Bergmann
2022-05-13  8:43   ` Masahiro Yamada
2022-05-13  9:01     ` Arnd Bergmann
2022-05-13  9:13       ` Masahiro Yamada

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