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From:   Florian Weimer <fweimer@redhat.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Joseph Myers <joseph@codesourcery.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Linux API <linux-api@vger.kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>,
        Laura Abbott <labbott@redhat.com>,
        Paul Burton <pburton@wavecomp.com>,
        Deepa Dinamani <deepa.kernel@gmail.com>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] uapi: avoid namespace conflict in linux/posix_types.h
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Date:   Mon, 17 Jun 2019 20:02:39 +0200
In-Reply-To: <CAHk-=wjCwnk0nfgCcMYqqX6o9bBrutDtut_fzZ-2VwiZR1y4kw@mail.gmail.com>
        (Linus Torvalds's message of "Mon, 17 Jun 2019 10:49:44 -0700")
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* Linus Torvalds:

>> A different approach would rename <asm/posix_types.h> to something more
>> basic, exclude the two structs, and move all internal #includes which do
>> need the structs to the new header.
>
> In fact, I wouldn't even rename <posix_types.h> at all, I'd just make
> sure it's namespace-clean.
>
> I _think_ the only thing causing problems is  '__kernel_fsid_t' due to
> that "val[]" thing, so just remove ity entirely, and add it to
> <statfs.h> instead.

There's also __kernel_fd_set in <linux/posix_types.h>.  I may have
lumped this up with <asm/posix_types.h>, but it has the same problem.

If it's okay to move them both to more natural places (maybe
<asm/statfs.h> and <linux/socket.h>), I think that should work well for
glibc.

However, application code may have to include additional header files.
I think the GCC/LLVM sanitizers currently get __kernel_fd_set from
<linux/posix_types.h> (but I think we discussed it before, they really
shouldn't use this type because it's misleading).

Thanks,
Florian