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Use busywait helper instead of unconditional sleep, reduces run time from 6m to 2:30 on my system. The busywait helper calls the function passed to it as argument; disable the shellcheck test for unreachable code, it generates many (false) warnings here. Signed-off-by: Florian Westphal <fw@strlen.de> Link: https://lore.kernel.org/r/20240423130604.7013-2-fw@strlen.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>