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| author | FUJITA Tomonori <fujita.tomonori@gmail.com> | 2025-08-21 09:20:54 +0900 |
|---|---|---|
| committer | Danilo Krummrich <dakr@kernel.org> | 2025-08-21 16:58:07 +0200 |
| commit | 842aedc3907deb154eedb88c7e4c3278c9b33701 (patch) | |
| tree | b67620de5b6620ca04e5f76a16729efc6663e509 | |
| parent | 44d454fcffa8b08d6d66df132121c1d387fa85db (diff) | |
| download | net-842aedc3907deb154eedb88c7e4c3278c9b33701.tar.gz | |
rust: Add cpu_relax() helper
Add cpu_relax() helper in preparation for supporting
read_poll_timeout().
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://lore.kernel.org/r/20250821002055.3654160-2-fujita.tomonori@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
| -rw-r--r-- | rust/helpers/helpers.c | 1 | ||||
| -rw-r--r-- | rust/helpers/processor.c | 8 | ||||
| -rw-r--r-- | rust/kernel/lib.rs | 1 | ||||
| -rw-r--r-- | rust/kernel/processor.rs | 14 |
4 files changed, 24 insertions, 0 deletions
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c index 44b2005d50140d..a90a87cff38c70 100644 --- a/rust/helpers/helpers.c +++ b/rust/helpers/helpers.c @@ -35,6 +35,7 @@ #include "pid_namespace.c" #include "platform.c" #include "poll.c" +#include "processor.c" #include "property.c" #include "rbtree.c" #include "rcu.c" diff --git a/rust/helpers/processor.c b/rust/helpers/processor.c new file mode 100644 index 00000000000000..d41355e14d6eb5 --- /dev/null +++ b/rust/helpers/processor.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/processor.h> + +void rust_helper_cpu_relax(void) +{ + cpu_relax(); +} diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index f8db761c5c95fc..953a6cba501cbe 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -111,6 +111,7 @@ pub mod pid_namespace; pub mod platform; pub mod prelude; pub mod print; +pub mod processor; pub mod rbtree; pub mod regulator; pub mod revocable; diff --git a/rust/kernel/processor.rs b/rust/kernel/processor.rs new file mode 100644 index 00000000000000..85b49b3614dd2d --- /dev/null +++ b/rust/kernel/processor.rs @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Processor related primitives. +//! +//! C header: [`include/linux/processor.h`](srctree/include/linux/processor.h) + +/// Lower CPU power consumption or yield to a hyperthreaded twin processor. +/// +/// It also happens to serve as a compiler barrier. +#[inline] +pub fn cpu_relax() { + // SAFETY: Always safe to call. + unsafe { bindings::cpu_relax() } +} |