Attribute Macro init_component 

#[init_component]

Register a function as a kernel component initializer.

Syntax

#[init_component]
#[init_component(bootstrap)]
#[init_component(bootstrap, priority = 1)]
#[init_component(kthread, priority = 2, depends_on = vfs_init)]
#[init_component(kthread, priority = 3, depends_on = [vfs_init, ipc_init])]

Argument	Type	Default	Description
stage	positional ident	bootstrap	bootstrap, kthread, or process
priority	integer	0	Lower = earlier (tiebreaker within topo level)
depends_on	ident or list	[]	Functions that must complete before this one

Example

#[init_component(bootstrap, priority = 1)]
fn vfs_init() -> Result<(), component::ComponentInitError> {
    vfs::init();
    Ok(())
}

#[init_component(kthread, priority = 2, depends_on = vfs_init)]
fn fs_ext4_init() -> Result<(), component::ComponentInitError> {
    fs_ext4::init();
    Ok(())
}

The annotated function is emitted unchanged; a companion #[used] static is placed in .component_entries so component::init_all() can discover, topologically sort, and call all registered components at runtime.