linux-kernel - Re: [PATCH V7 03/16] rust: cpu: Add from

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Message-ID: <20250115075859.mjpcvwctxx2vutpu@vireshk-i7>
Date: Wed, 15 Jan 2025 13:28:59 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH V7 03/16] rust: cpu: Add from_cpu()

On 15-01-25, 08:54, Greg KH wrote:
> Ah, but that's not really something that SAFETY should override, right?
> 
> Yes, you know your implementation of this will stop using the pointer in
> the hotplug callback before it goes away but that's not documented here.
> And having the device "fail" afterward isn't really ok either as you are
> relying on the driver core to always check for this and I'm not so sure
> that it always does on all codepaths.
> 
> But, I'm ok with this for now, as you are just copying the bad C model
> at the moment, but it really feels like a huge foot-gun waiting to go
> off.  Any way to put some more documentation here as in "use this at
> your own risk!"?

What about marking it unsafe ? That would require callers to document
why it is safe to call this. And yes add more documentation here too.

-- 
viresh