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The table_lock lock can be taken in atomic context and therefore cannot be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Reported-by: Andreas Sundebo <kernel@sundebo.dk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Andreas Sundebo <kernel@sundebo.dk> Signed-off-by: Ingo Molnar <mingo@elte.hu>