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From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 19 Jul 2021 23:31:33 +0200
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Subject: Re: [TECH TOPIC] Rust for Linux
To: Wedson Almeida Filho <wedsonaf@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Linus Walleij <linus.walleij@linaro.org>, 
	Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>, Greg KH <greg@kroah.com>, 
	Bartosz Golaszewski <bgolaszewski@baylibre.com>, Kees Cook <keescook@chromium.org>, 
	Jan Kara <jack@suse.cz>, James Bottomley <James.Bottomley@hansenpartnership.com>, 
	Julia Lawall <julia.lawall@inria.fr>, 
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Roland Dreier <roland@kernel.org>, 
	ksummit@lists.linux.dev, Viresh Kumar <viresh.kumar@linaro.org>
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On Mon, Jul 19, 2021 at 7:32 PM Wedson Almeida Filho
<wedsonaf@google.com> wrote:
> On Mon, Jul 19, 2021 at 04:02:38PM +0200, Arnd Bergmann wrote:
>
> At the moment we lose information about the device, but simply because we
> haven't implemented dev_ variants yet, there is no fundamental reason for this
> though.
>
...
>
> Yes, it uses spinlock_t. But again, just because we don't have an implementation
> that uses raw_spinlock_t yet.
>
...
> It's not there yet, but the idea is to wrap the place where `drv.pm` is
> initialised in the amba code with `if cfg!(CONFIG_PM)` -- if CONFIG_PM is
> disabled, all references to PM code are gone and they are removed by the
> compiler. This way we move configuration-dependent code out of drivers and into
> core libraries.

Ok, that all sounds good to me. I'll reply separately on the coding style.

       Arnd