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Wed, 05 Nov 2025 15:02:27 -0800 (PST) From: Mitchell Levy Date: Wed, 05 Nov 2025 15:01:14 -0800 Subject: [PATCH v4 2/9] rust: cpumask: Add getters for globally defined cpumasks MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251105-rust-percpu-v4-2-984b1470adcb@gmail.com> References: <20251105-rust-percpu-v4-0-984b1470adcb@gmail.com> In-Reply-To: <20251105-rust-percpu-v4-0-984b1470adcb@gmail.com> To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Andrew Morton , Dennis Zhou , Tejun Heo , Christoph Lameter , Danilo Krummrich , Benno Lossin , Yury Norov , Viresh Kumar Cc: Tyler Hicks , Allen Pais , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-mm@kvack.org, Mitchell Levy X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1762383744; l=3255; i=levymitchell0@gmail.com; s=20240719; h=from:subject:message-id; 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has bit `cpu` set iff cpu is populatable + #[inline] + pub fn possible_cpus() -> &'static Self { + // SAFETY: `__cpu_possible_mask` is a valid global provided by the kernel that lives + // forever. + unsafe { Cpumask::as_ref(&raw const bindings::__cpu_possible_mask) } + } + + /// Get a CPU mask representing online CPUs; has bit `cpu` set iff cpu available to the + /// scheduler + #[inline] + pub fn online_cpus() -> &'static Self { + // SAFETY: `__cpu_online_mask` is a valid global provided by the kernel that lives forever. + // Since we wrap the returned pointer in an `Opaque`, it's ok that `__cpu_online_mask` + // may change its value. + unsafe { Cpumask::as_ref(&raw const bindings::__cpu_online_mask) } + } + + /// Get a CPU mask representing enabled CPUs; has bit `cpu` set iff cpu can be brought online + #[inline] + pub fn enabled_cpus() -> &'static Self { + // SAFETY: `__cpu_enabled_mask` is a valid global provided by the kernel that lives forever. + // Since we wrap the returned pointer in an `Opaque`, it's ok that `__cpu_enabled_mask` + // may change its value. + unsafe { Cpumask::as_ref(&raw const bindings::__cpu_enabled_mask) } + } + + /// Get a CPU mask representing present CPUs; has bit `cpu` set iff cpu is populated + #[inline] + pub fn present_cpus() -> &'static Self { + // SAFETY: `__cpu_present_mask` is a valid global provided by the kernel that lives + // forever. Since we wrap the returned pointer in an `Opaque`, it's ok that + // `__cpu_present_mask` may change its value. + unsafe { Cpumask::as_ref(&raw const bindings::__cpu_present_mask) } + } + + /// Get a CPU mask representing active CPUs; has bit `cpu` set iff cpu is available to + /// migration. + #[inline] + pub fn active_cpus() -> &'static Self { + // SAFETY: `__cpu_active_mask` is a valid global provided by the kernel that lives forever. + // Since we wrap the returned pointer in an `Opaque`, it's ok that `__cpu_active_mask` + // may change its value. + unsafe { Cpumask::as_ref(&raw const bindings::__cpu_active_mask) } + } + /// Obtain the raw `struct cpumask` pointer. pub fn as_raw(&self) -> *mut bindings::cpumask { let this: *const Self = self; -- 2.34.1