linux-kernel - Re: [PATCH 00/17] Rust support

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Message-ID: <YPn3fgDX8uNkF8Vp@google.com>
Date:   Thu, 22 Jul 2021 23:55:58 +0100
From:   Wedson Almeida Filho <wedsonaf@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Finn Behrens <finn@...enk.dev>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        rust-for-linux <rust-for-linux@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/17] Rust support

Hey Matthew,

On Thu, Jul 08, 2021 at 01:58:32AM +0100, Matthew Wilcox wrote:
> Why are you so resistant to writing a real driver that deals with actual
> hardware?  

I don't think it was so much resistance but rather a prioritisation thing. Have
you by any chance seen the gpio driver I posted a couple of days ago?

> A simple NVMe driver is less than a thousand lines of C.
> I know the one in the kernel now is ridiculously complicated and has
> been thoroughly messed up with abstractions to support NVMeoF instead
> of having a separate driver, but it's really a simple interface at heart.

The latest NVMe spec is 452 pages long, which seems to contradict your claim
that it's simple. In any case, translating less than 1K lines of C shouldn't be
too hard (after I've built the abstractions, of course). Would you mind sharing
the simple driver you mention above?

Thanks,
-Wedson