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46f045db5a
Add read_poll_timeout_atomic function which polls periodically until a condition is met, an error occurs, or the attempt limit is reached. The C's read_poll_timeout_atomic() is used for the similar purpose. In atomic context the timekeeping infrastructure is unavailable, so reliable time-based timeouts cannot be implemented. So instead, the helper accepts a maximum number of attempts and busy-waits (udelay + cpu_relax) between tries. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Link: https://patch.msgid.link/20251103112958.2961517-3-fujita.tomonori@gmail.com [ Adjust imports to use "kernel vertical" style. - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>