rust: workqueue: replace deprecated system_wq with system_{percpu,dfl}_wq

system_wq is deprecated and triggers a runtime warning:

	[    0.857414] workqueue: work func ...WorkItemPointerKy0_E3runB7_ enqueued on deprecated workqueue. Use system_{percpu|dfl}_wq instead.

Replace system() with system_percpu() and system_dfl(), to match the
previous behavior of the deprecated system() and convert doc examples
and tests to system_dfl().

system_unbound_wq is deprecated in the same way, in favor of
system_dfl_wq. Since system_unbound() has no users, just remove it as
well.

Fixes: 64d8eae3f895 ("workqueue: Add warnings and fallback if system_{unbound}_wq is used")
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Boqun Feng <boqun@kernel.org>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Acked-by: Marco Crivellari <marco.crivellari@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://patch.msgid.link/20261014-rust-workqueue-system-fix-v2-1-c018b8f870f9@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/rust/kernel/sync/completion.rs b/rust/kernel/sync/completion.rs
index 35ff049ff078..1771bfc0ade2 100644
--- a/rust/kernel/sync/completion.rs
+++ b/rust/kernel/sync/completion.rs
@@ -38,7 +38,7 @@ use crate::{bindings, prelude::*, types::Opaque};
 ///             done <- Completion::new(),
 ///         }), GFP_KERNEL)?;
 ///
-///         let _ = workqueue::system().enqueue(this.clone());
+///         let _ = workqueue::system_dfl().enqueue(this.clone());
 ///
 ///         Ok(this)
 ///     }