rust: time: fix as_micros_ceil() rounding near i64::MAX

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The ceiling adjustment used saturating_add(NSEC_PER_USEC - 1) before
dividing. Once the nanosecond value gets within NSEC_PER_USEC - 1 of
i64::MAX the addition saturates to i64::MAX, which drops the ceiling
bias and can yield a result one microsecond too small.

Fixes: fae0cdc123 ("rust: time: Introduce Delta type")
Reported-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Closes: https://lore.kernel.org/rust-for-linux/CANiq72mtS0ABA2JnT5tpz6J9c_mnxY+vyPvghV_ukngWvN8F2w@mail.gmail.com/
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Acked-by: Andreas Hindborg <a.hindborg@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260807130531.1056209-1-tomo@flapping.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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FUJITA Tomonori 2026-08-07 22:05:31 +09:00 • committed by Miguel Ojeda

parent 409d09194c

commit ec90dfcf05

1 changed files with 10 additions and 7 deletions

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rust/kernel/time.rs

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