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Fri, 2 Oct 2026 01:06:28 -0400 (EDT) From: FUJITA Tomonori To: a.hindborg@kernel.org, aliceryhl@google.com, arve@android.com, boqun@kernel.org, brauner@kernel.org, cmllamas@google.com, gary@garyguo.net, gregkh@linuxfoundation.org, ojeda@kernel.org, tj@kernel.org, tkjos@android.com Cc: acourbot@nvidia.com, anna-maria@linutronix.de, bjorn3_gh@protonmail.com, dakr@kernel.org, daniel.almeida@collabora.com, frederic@kernel.org, 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, jiangshanlai@gmail.com, markus.probst@posteo.de, FUJITA Tomonori Subject: [PATCH v8 2/4] rust: time: add Delta::as_jiffies_unsigned() Date: Fri, 2 Oct 2026 14:04:26 +0900 Message-ID: <20261002050428.2746277-3-tomo@flapping.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261002050428.2746277-1-tomo@flapping.org> References: <20261002050428.2746277-1-tomo@flapping.org> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: FUJITA Tomonori Delta is signed, but some C functions, such as queue_delayed_work_on(), take a span in jiffies as unsigned long. So each caller has to clamp a negative value to zero and cast it before it passes the value to C. Add a helper that does both. Suggested-by: Gary Guo Signed-off-by: FUJITA Tomonori --- rust/kernel/time.rs | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs index 9f231bf25ead..b6a2aab12a50 100644 --- a/rust/kernel/time.rs +++ b/rust/kernel/time.rs @@ -363,6 +363,27 @@ pub const fn from_jiffies(jiffies: isize) -> Self { pub const fn as_jiffies(self) -> isize { self.value } + + /// Return the number of jiffies in the [`Delta`] as an unsigned value. + /// + /// If the number of jiffies is negative, zero is returned. + /// + /// # Examples + /// + /// ``` + /// use kernel::time::Delta; + /// + /// // A negative span returns zero. + /// assert_eq!(Delta::from_jiffies(-1).as_jiffies_unsigned(), 0); + /// + /// // A positive span returns its value. + /// assert_eq!(Delta::from_jiffies(1).as_jiffies_unsigned(), 1); + /// ``` + #[inline] + pub fn as_jiffies_unsigned(self) -> usize { + // CAST: `isize::max()` makes the value non-negative, so the cast keeps it. + isize::max(self.value, 0) as usize + } } impl ops::Add for Delta { -- 2.43.0