[boqun:rust-sync 19/24] warning: unresolved link to `rcu::Guard`

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git rust-sync
head:   6f6629ab2185d27cbc65d7d85908159b1293c082
commit: f27758ba5f0adefa226d8fc91c73e2300cf97ca9 [19/24] rust: sync: Add abstraction for synchronize_rcu()
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260725/[email protected]/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260725/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>):

>> warning: unresolved link to `rcu::Guard`
   --> rust/kernel/sync/rcu.rs:57:9
   |
   57 | /// a [`rcu::Guard`]) at the moment of the function call to finish.
   |         ^^^^^^^^^^ no item named `rcu` in scope
   |
   = note: `#[warn(rustdoc::broken_intra_doc_links)]` on by default

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