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f523d110a6
When Rust Binder assigns a new ID, it performs various fallible operations before it "commits" to actually using the new ID. To support this pattern, change acquire_next_id() so that it does not immediately call set_bit(), but instead returns an object that may be used to call set_bit() later. The UnusedId type holds a exclusive reference to the IdPool, so it's guaranteed that nobody else can call find_unused_id() while the UnusedId object is live. [Miguel: rust: id_pool: fix example] Reviewed-by: Burak Emir <bqe@google.com> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Signed-off-by: Alice Ryhl <aliceryhl@google.com> Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>