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The CPU sync functions are a NOP for !CONFIG_SMP. But for !CONFIG_SMP they still need to disable interrupts in order to preserve context within the CPU sync sections. Signed-off-by: John Ogness <[email protected]> Reviewed-by: Petr Mladek <[email protected]> Reviewed-by: Sergey Senozhatsky <[email protected]> Signed-off-by: Petr Mladek <[email protected]> Link: https://lore.kernel.org/r/[email protected]