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synchronize_rcu() is a frequently used C function which is always safe to be called. Add a safe abstraction for synchronize_rcu(). Signed-off-by: Philipp Stanner <phasta@kernel.org> Reviewed-by: Onur Özkan <work@onurozkan.dev> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Reviewed-by: Gary Guo <gary@garyguo.net> [boqun: Fix rustdoc reported by kernel test robot <lkp@intel.com>] Signed-off-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/20260624150704.1504001-3-phasta@kernel.org