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Add udelay() function, inserts a delay based on microseconds with busy waiting, in preparation for supporting read_poll_timeout_atomic(). Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Acked-by: Andreas Hindborg <a.hindborg@kernel.org> Link: https://patch.msgid.link/20251103112958.2961517-2-fujita.tomonori@gmail.com Signed-off-by: Danilo Krummrich <dakr@kernel.org>