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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2024 Google LLC.
//! Logic for static keys.//!//! C header: [`include/linux/jump_label.h`](srctree/include/linux/jump_label.h).
/// Branch based on a static key.////// Takes three arguments:////// * `key` - the path to the static variable containing the `static_key`./// * `keytyp` - the type of `key`./// * `field` - the name of the field of `key` that contains the `static_key`.////// # Safety////// The macro must be used with a real static key defined by C.#[macro_export]macro_rules! static_branch_unlikely { ($key:path, $keytyp:ty, $field:ident) => {{ let _key: *const $keytyp = ::core::ptr::addr_of!($key); let _key: *const $crate::bindings::static_key_false = ::core::ptr::addr_of!((*_key).$field); let _key: *const $crate::bindings::static_key = _key.cast();
#[cfg(not(CONFIG_JUMP_LABEL))] { $crate::bindings::static_key_count(_key.cast_mut()) > 0 }
#[cfg(CONFIG_JUMP_LABEL)] $crate::jump_label::arch_static_branch! { $key, $keytyp, $field, false } }};}pub use static_branch_unlikely;
/// Assert that the assembly block evaluates to a string literal.#[cfg(CONFIG_JUMP_LABEL)]const _: &str = include!(concat!( env!("OBJTREE"), "/rust/kernel/generated_arch_static_branch_asm.rs"));
#[macro_export]#[doc(hidden)]#[cfg(CONFIG_JUMP_LABEL)]macro_rules! arch_static_branch { ($key:path, $keytyp:ty, $field:ident, $branch:expr) => {'my_label: { $crate::asm!( include!(concat!(env!("OBJTREE"), "/rust/kernel/generated_arch_static_branch_asm.rs")); l_yes = label { break 'my_label true; }, symb = sym $key, off = const ::core::mem::offset_of!($keytyp, $field), branch = const $crate::jump_label::bool_to_int($branch), );
break 'my_label false; }};}
#[cfg(CONFIG_JUMP_LABEL)]pub use arch_static_branch;
/// A helper used by inline assembly to pass a boolean to as a `const` parameter.////// Using this function instead of a cast lets you assert that the input is a boolean, and not some/// other type that can also be cast to an integer.#[doc(hidden)]pub const fn bool_to_int(b: bool) -> i32 { b as i32}