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Date: Tue, 19 May 2026 19:23:05 +0200
Message-Id: <DIMTSQS1HZM9.326ZOXFP6PV5J@kernel.org>
Cc: <gregkh@linuxfoundation.org>, <rafael@kernel.org>,
 <acourbot@nvidia.com>, <aliceryhl@google.com>, <david.m.ertman@intel.com>,
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To: "Gary Guo" <gary@garyguo.net>
From: "Danilo Krummrich" <dakr@kernel.org>
Subject: Re: [PATCH v3 22/27] rust: driver-core: rename 'a lifetime to
 'bound
References: <20260517000149.3226762-1-dakr@kernel.org>
 <20260517000149.3226762-23-dakr@kernel.org>
 <DIMT8FK3A307.11FI5MGH9K1OX@garyguo.net>
In-Reply-To: <DIMT8FK3A307.11FI5MGH9K1OX@garyguo.net>

On Tue May 19, 2026 at 6:56 PM CEST, Gary Guo wrote:
> On Sun May 17, 2026 at 1:01 AM BST, Danilo Krummrich wrote:
>> -    pub fn access<'a>(&'a self, dev: &'a Device<Bound>) -> Result<&'a T=
> {
>> +    pub fn access<'bound>(&'bound self, dev: &'bound Device<Bound>) -> =
Result<&'bound T> {
>>          if self.dev.as_raw() !=3D dev.as_raw() {
>>              return Err(EINVAL);
>>          }
>
> For the same reason that I outlined in the other email, I think this shou=
ld keep
> the generic `'a` name as this is not the actual lifetime of `'bound`, jus=
t a
> shortened one.

I think it depends on how you want to read it, i.e. do we consider 'bound t=
o be:

  - the lifetime for the full duration of a device bound to a driver, or
  - some lifetime that guarantees that the device remains bound for (which =
can
    also be shorter).

For this and the other cases you commented on I obviously applied the secon=
d
interpretation.

That said, I think for consistency and ambiguity reasons it does make sense=
 to
reserve the term 'bound for the first one exclusively, and also clearly doc=
ument
that.