Re: [RFC 00/19] Kernel API Specification Framework

Dmitry Vyukov
2025-06-25T08:49:21Z

On Tue, 24 Jun 2025 at 22:04, Sasha Levin <sashal@kernel.org> wrote:

> >3. To reduce duplication we could use more type information, e.g. I was always
> >frustrated that close is just:
> >
> >SYSCALL_DEFINE1(close, unsigned int, fd)
> >
> >whereas if we would do:
> >
> >typedef int fd_t;
> >SYSCALL_DEFINE1(close, fd_t, fd)
> >
> >then all semantic info about the arg is already in the code.
>
> Yup. It would also be great if we completely drop the SYSCALL_DEFINE()
> part and have it be automatically generated by the spec itself, but I
> couldn't wrap my head around doing this in C macro just yet.

At some point I was looking at boost.pp library as the source of info
on how to do things. It provides a set of containers and algorithms on
them:
https://www.boost.org/doc/libs/latest/libs/preprocessor/doc/index.html

Sequences may be the most appealing b/c they support variable number
of elements, and don't need specifying number of elements explicitly:
https://www.boost.org/doc/libs/latest/libs/preprocessor/doc/data/sequences.html
A sequence then allows generating multiple things from it using
foreach over elements.