From: Andreas Hindborg <a.hindborg@kernel.org>
To: FUJITA Tomonori <tomo@flapping.org>, ojeda@kernel.org
Cc: acourbot@nvidia.com, aliceryhl@google.com,
anna-maria@linutronix.de, bjorn3_gh@protonmail.com,
boqun@kernel.org, dakr@kernel.org, daniel.almeida@collabora.com,
frederic@kernel.org, gary@garyguo.net, jstultz@google.com,
lossin@kernel.org, lyude@redhat.com, sboyd@kernel.org,
tamird@kernel.org, tglx@kernel.org, tmgross@umich.edu,
work@onurozkan.dev, rust-for-linux@vger.kernel.org,
FUJITA Tomonori <fujita.tomonori@gmail.com>
Subject: Re: [PATCH v1] rust: time: fix as_micros_ceil() to round correctly for negative Delta
Date: Fri, 17 Jul 2026 22:26:33 +0200 [thread overview]
Message-ID: <877bmtgy6e.fsf@kernel.org> (raw)
In-Reply-To: <20260713225235.3243480-1-tomo@flapping.org>
"FUJITA Tomonori" <tomo@flapping.org> writes:
> From: FUJITA Tomonori <fujita.tomonori@gmail.com>
>
> The ceiling-division idiom `(n + d - 1) / d` only produces the
> correct result when `n` is non-negative.
>
> For example, if n = -1000 (exactly -1us), the old code computed (-1000
> + 999) / 1000 == 0 instead of -1.
>
> For negative n, truncating division already rounds towards positive
> infinity, so no bias is needed in that case.
>
> Fixes: fae0cdc12340 ("rust: time: Introduce Delta type")
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Acked-by: Andreas Hindborg <a.hindborg@kernel.org>
@Miguel, can you take this with rust fixes?
Best regards,
Andreas Hindborg
prev parent reply other threads:[~2026-07-17 20:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <N3Mcf328j6hi7HCJTp14HUC6-cxRUNgQLjvAdkFhIuZM-yYM91SYBYsW7kEVHRkqTzm1B3zgl5Bat4dpSIfXtA==@protonmail.internalid>
2026-07-13 22:52 ` [PATCH v1] rust: time: fix as_micros_ceil() to round correctly for negative Delta FUJITA Tomonori
2026-07-14 9:09 ` Miguel Ojeda
2026-07-14 10:16 ` FUJITA Tomonori
2026-07-14 10:38 ` Miguel Ojeda
2026-07-14 10:49 ` FUJITA Tomonori
2026-07-14 10:56 ` Gary Guo
2026-07-14 12:17 ` FUJITA Tomonori
2026-07-14 12:31 ` Miguel Ojeda
2026-07-14 12:57 ` Alice Ryhl
2026-07-14 14:21 ` Miguel Ojeda
2026-07-17 20:31 ` Andreas Hindborg
2026-07-14 12:18 ` Miguel Ojeda
2026-07-17 20:26 ` Andreas Hindborg [this message]
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