rust: optimize rust symbol generation for SeqFile

When build the kernel using the llvm-18.1.3-rust-1.85.0-x86_64
with ARCH=arm64, the following symbols are generated:

$nm vmlinux | grep ' _R'.*SeqF

rust: optimize rust symbol generation for SeqFile

When build the kernel using the llvm-18.1.3-rust-1.85.0-x86_64
with ARCH=arm64, the following symbols are generated:

$nm vmlinux | grep ' _R'.*SeqFile | rustfilt
ffff8000805b78ac T <kernel::seq_file::SeqFile>::call_printf

This Rust symbol is trivial wrappers around the C functions seq_printf.
It doesn't make sense to go through a trivial wrapper for its functions,
so mark it inline.

Link: https://github.com/Rust-for-Linux/linux/issues/1145
Suggested-by: Alice Ryhl <[email protected]>
Co-developed-by: Grace Deng <[email protected]>
Signed-off-by: Grace Deng <[email protected]>
Signed-off-by: Kunwu Chan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Alice Ryhl <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

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rust: improve lifetimes markup

Improve lifetimes markup; e.g. from:

/// ... 'a ...

to:

/// ... `'a` ...

This will make lifetimes display as code span with Markdown and make it
more consi

rust: improve lifetimes markup

Improve lifetimes markup; e.g. from:

/// ... 'a ...

to:

/// ... `'a` ...

This will make lifetimes display as code span with Markdown and make it
more consistent with rest of the docs.

Link: https://github.com/Rust-for-Linux/linux/issues/1138
Signed-off-by: Borys Tyran <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Reworded and changed Closes tag to Link. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

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rust: finish using custom FFI integer types

In the last kernel cycle we migrated most of the `core::ffi` cases in
commit d072acda4862 ("rust: use custom FFI integer types"):

Currently FFI integ

rust: finish using custom FFI integer types

In the last kernel cycle we migrated most of the `core::ffi` cases in
commit d072acda4862 ("rust: use custom FFI integer types"):

Currently FFI integer types are defined in libcore. This commit
creates the `ffi` crate and asks bindgen to use that crate for FFI
integer types instead of `core::ffi`.

This commit is preparatory and no type changes are made in this
commit yet.

Finish now the few remaining/new cases so that we perform the actual
remapping in the next commit as planned.

Acked-by: Jocelyn Falempe <[email protected]> # drm
Link: https://lore.kernel.org/rust-for-linux/CANiq72m_rg42SvZK=bF2f0yEoBLVA33UBhiAsv8THhVu=G2dPA@mail.gmail.com/
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Miguel Ojeda <[email protected]>

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rust: add seqfile abstraction

This adds a simple seq file abstraction that lets you print to a seq
file using ordinary Rust printing syntax.

An example user from Rust Binder:

pub(crate) fn ful

rust: add seqfile abstraction

This adds a simple seq file abstraction that lets you print to a seq
file using ordinary Rust printing syntax.

An example user from Rust Binder:

pub(crate) fn full_debug_print(
&self,
m: &SeqFile,
owner_inner: &mut ProcessInner,
) -> Result<()> {
let prio = self.node_prio();
let inner = self.inner.access_mut(owner_inner);
seq_print!(
m,
" node {}: u{:016x} c{:016x} pri {}:{} hs {} hw {} cs {} cw {}",
self.debug_id,
self.ptr,
self.cookie,
prio.sched_policy,
prio.prio,
inner.strong.has_count,
inner.weak.has_count,
inner.strong.count,
inner.weak.count,
);
if !inner.refs.is_empty() {
seq_print!(m, " proc");
for node_ref in &inner.refs {
seq_print!(m, " {}", node_ref.process.task.pid());
}
}
seq_print!(m, "\n");
for t in &inner.oneway_todo {
t.debug_print_inner(m, " pending async transaction ");
}
Ok(())
}

The `SeqFile` type is marked not thread safe so that `call_printf` can
be a `&self` method. The alternative is to use `self: Pin<&mut Self>`
which is inconvenient, or to have `SeqFile` wrap a pointer instead of
wrapping the C struct directly.

Signed-off-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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