linux-kernel - Re: [PATCH] rust: time: New module for timekeeping functions

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Message-ID: <CANiq72n-++roTv3yDNOA=Mi_sscBZX3xPdZ6RZ0Oxx+T82pf5A@mail.gmail.com>
Date:   Tue, 21 Feb 2023 23:29:21 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Asahi Lina <lina@...hilina.net>, Boqun Feng <boqun.feng@...il.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        John Stultz <jstultz@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, asahi@...ts.linux.dev
Subject: Re: [PATCH] rust: time: New module for timekeeping functions

On Tue, Feb 21, 2023 at 7:45 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> But xb abd xr are the same datatype because they represent a time delta.

In principle, one could also have different duration types too. For
instance, C++'s `std::chrono::duration` type is parametrized on the
representation type and the tick period, and thus an operation between
two time points like t1 - t0 returns a duration type that depends on
the type of the time points, i.e. which clock they were obtained from.

Cheers,
Miguel