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Add Thread Safety Analysis (TSA) annotations for the FIFO implementation. This consists of indicating which fields are protected by a spinlock and annotating functionst that must be called under a spinlock. sbi_fifo_init() must be excluded, as acquiring a spinlock before it is initialized does not make sense. Signed-off-by: Carlos López <carlos.lopezr4096@gmail.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260909162322.29778-5-carlos.lopezr4096@gmail.com Signed-off-by: Anup Patel <anup@brainfault.org>