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The kernel provides a variety of locking primitives. The nesting of these lock types and the implications of them on RT enabled kernels is nowhere documented. Add initial documentation. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200321113242.026561244@linutronix.de