linux-kernel - Re: [GIT PULL] __auto_type conversion for v6.19-rc1

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Message-ID: <CAHk-=wi=2errb29CgwA4eSaLCEojo2Jq1d3ptDhxANfcKPH9xw@mail.gmail.com>
Date: Wed, 10 Dec 2025 05:40:51 +0900
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: "H. Peter Anvin" <hpa@...or.com>, Eugenio Pérez <eperezma@...hat.com>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Alexey Dobriyan <adobriyan@...il.com>, 
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	Yufeng Wang <wangyufeng@...inos.cn>, bpf@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-sparse@...r.kernel.org, virtualization@...ts.linux.dev, x86@...nel.org
Subject: Re: [GIT PULL] __auto_type conversion for v6.19-rc1

On Tue, 9 Dec 2025 at 18:06, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> BTW, speaking of C23 fun that is supported by gcc 8, but not by sparse:
> __has_include().
>
> Linus?  Seeing that I'm touching pre-process.c anyway for the sake of
> __VA_OPT__, adding that thing ought to be reasonably easy

It sounds straightforward, and I'm certainly not going to object. I'm
not sure how much we'd want to use it in the kernel: it might make it
slightly easier to deal with various architectures and the "if the
architecture has this header, use it, otherwise use the generic
implementation" kinds of issues, but we do have fairly straightforward
solutions for that already in our build system ('generic-y' and
friends).

So I'm not convinced it really buys us anything - I suspect it's a lot
more useful in "normal" projects that have to deal with non-standard
system headers and possible lack of libraries etc etc. Our build
environment is so self-sufficient that it's not nearly the same issue
for the kernel.

              Linus