Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2024 Google LLC.
//! Logic for tracepoints.
/// Declare the Rust entry point for a tracepoint.////// This macro generates an unsafe function that calls into C, and its safety requirements will be/// whatever the relevant C code requires. To document these safety requirements, you may add/// doc-comments when invoking the macro.#[macro_export]macro_rules! declare_trace { ($($(#[$attr:meta])* $pub:vis unsafe fn $name:ident($($argname:ident : $argtyp:ty),* $(,)?);)*) => {$( $( #[$attr] )* #[inline(always)] $pub unsafe fn $name($($argname : $argtyp),*) { #[cfg(CONFIG_TRACEPOINTS)] { // SAFETY: It's always okay to query the static key for a tracepoint. let should_trace = unsafe { $crate::macros::paste! { $crate::jump_label::static_branch_unlikely!( $crate::bindings::[< __tracepoint_ $name >], $crate::bindings::tracepoint, key ) } };
if should_trace { $crate::macros::paste! { // SAFETY: The caller guarantees that it is okay to call this tracepoint. unsafe { $crate::bindings::[< rust_do_trace_ $name >]($($argname),*) }; } } }
#[cfg(not(CONFIG_TRACEPOINTS))] { // If tracepoints are disabled, insert a trivial use of each argument // to avoid unused argument warnings. $( let _unused = $argname; )* } } )*}}
pub use declare_trace;