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using cpu_relax in busy loops is a well-known idiom in the kernel. It's more for documentation purposes than technically needed here. Cc: Jamie Iles <jamie@jamieiles.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>