linux-kernel - Re: [PATCH v3] rust: ioctl: Add ioctl number manipulation functions

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Message-ID: <be81649f-ff58-8c0a-8594-94ea1bd2ee4a@asahilina.net>
Date:   Thu, 23 Mar 2023 23:00:20 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, asahi@...ts.linux.dev,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v3] rust: ioctl: Add ioctl number manipulation functions

On 23/03/2023 22.05, Miguel Ojeda wrote:
> On Thu, Mar 23, 2023 at 1:34 PM Asahi Lina <lina@...hilina.net> wrote:
>>
>> Changes in v3:
>> - Actually made the change intended in v2.
>> - Link to v2: https://lore.kernel.org/r/20230224-rust-ioctl-v2-1-5325e76a92df@asahilina.net
>>
>> Changes in v2:
>> - Changed from assert!() to build_assert!() (static_assert!() can't work
>>    here)
>> - Link to v1: https://lore.kernel.org/r/20230224-rust-ioctl-v1-1-5142d365a934@asahilina.net
> 
> It seems `#[inline(always)]` got added to a few of those, right? (The
> addition looks fine to me, but just to understand if is it an omission
> in the changelog, or an unintended change, or intended for another
> reason).

Ah yes, I should've mentioned that! build_assert!() only works for stuff 
that can be const-optimized at build time, which requires inlining. 
Otherwise this change immediately causes build failures since generic 
variants of the functions get compiled (and since they're public 
functions, cannot be optimized out at link time).

> 
> Thanks!
> 
> Cheers,
> Miguel
> 

~~ Lina