linux-kernel - Re: [PATCH 2/6] list: add new MACROs to make iterator invisiable

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Date:   Sat, 12 Mar 2022 13:43:50 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Xiaomeng Tong <xiam0nd.tong@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/6] list: add new MACROs to make iterator invisiable

On Sat, Mar 12, 2022 at 2:24 AM Michał Mirosław <mirq-linux@...e.qmqm.pl> wrote:
>
> The source type is not needed for the macros [..]

Ahh. Yeah, as long as we don't do typedefs, it looks like we don't
need to pre-declare the member access types.

I expected that to be required, because function declarations taking
arguments need it, but that's because they create their own scope.
Just doing it in a regular struct (or in this case union) declaration
is fine.

So we would only need that post-declaration.

That said, your naming is wrong. It's not just about "self". It's any
case where the type we iterate over is declared after the type that
has the head.

So I suspect it would be a lot better to just always do it, and not do
that "self vs non-self" distinction.

              Linus