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8af7a50167
After a source tree build of the kernel, and having used the `RSCPP`
rule, running `rustfmt` fails with:
error: macros that expand to items must be delimited with braces or followed by a semicolon
--> rust/kernel/arch_static_branch_asm.rs:1:27
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1 | ...ls!("1: jmp " ... ".popsection \n\t")
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: change the delimiters to curly braces
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1 | ::kernel::concat_literals!{"1: jmp " ... ".popsection \n\t"}
| ~ ~
help: add a semicolon
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1 | ::kernel::concat_literals!("1: jmp " ... ".popsection \n\t");
| +
This file is not meant to be formatted nor works on its own since it is
meant to be textually included.
Thus skip formatting it by prefixing its name with `generated_`.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Gary Guo <gary@garyguo.net>
Cc: Björn Roy Baron <bjorn3_gh@protonmail.com>
Cc: Benno Lossin <benno.lossin@proton.me>
Cc: Andreas Hindborg <a.hindborg@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Trevor Gross <tmgross@umich.edu>
Link: https://lore.kernel.org/20241120175916.58860-1-ojeda@kernel.org
Fixes: 169484ab66 ("rust: add arch_static_branch")
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
75 lines
2.3 KiB
Rust
75 lines
2.3 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2024 Google LLC.
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//! Logic for static keys.
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//!
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//! C header: [`include/linux/jump_label.h`](srctree/include/linux/jump_label.h).
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/// Branch based on a static key.
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///
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/// Takes three arguments:
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///
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/// * `key` - the path to the static variable containing the `static_key`.
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/// * `keytyp` - the type of `key`.
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/// * `field` - the name of the field of `key` that contains the `static_key`.
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///
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/// # Safety
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///
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/// The macro must be used with a real static key defined by C.
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#[macro_export]
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macro_rules! static_branch_unlikely {
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($key:path, $keytyp:ty, $field:ident) => {{
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let _key: *const $keytyp = ::core::ptr::addr_of!($key);
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let _key: *const $crate::bindings::static_key_false = ::core::ptr::addr_of!((*_key).$field);
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let _key: *const $crate::bindings::static_key = _key.cast();
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#[cfg(not(CONFIG_JUMP_LABEL))]
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{
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$crate::bindings::static_key_count(_key.cast_mut()) > 0
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}
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#[cfg(CONFIG_JUMP_LABEL)]
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$crate::jump_label::arch_static_branch! { $key, $keytyp, $field, false }
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}};
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}
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pub use static_branch_unlikely;
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/// Assert that the assembly block evaluates to a string literal.
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#[cfg(CONFIG_JUMP_LABEL)]
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const _: &str = include!(concat!(
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env!("OBJTREE"),
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"/rust/kernel/generated_arch_static_branch_asm.rs"
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));
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#[macro_export]
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#[doc(hidden)]
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#[cfg(CONFIG_JUMP_LABEL)]
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macro_rules! arch_static_branch {
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($key:path, $keytyp:ty, $field:ident, $branch:expr) => {'my_label: {
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$crate::asm!(
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include!(concat!(env!("OBJTREE"), "/rust/kernel/generated_arch_static_branch_asm.rs"));
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l_yes = label {
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break 'my_label true;
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},
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symb = sym $key,
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off = const ::core::mem::offset_of!($keytyp, $field),
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branch = const $crate::jump_label::bool_to_int($branch),
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);
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break 'my_label false;
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}};
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}
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#[cfg(CONFIG_JUMP_LABEL)]
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pub use arch_static_branch;
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/// A helper used by inline assembly to pass a boolean to as a `const` parameter.
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///
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/// Using this function instead of a cast lets you assert that the input is a boolean, and not some
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/// other type that can also be cast to an integer.
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#[doc(hidden)]
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pub const fn bool_to_int(b: bool) -> i32 {
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b as i32
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}
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