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2017-01-25rcutorture: Add CBMC-based formal verification for SRCULance Roy40-0/+1582
This commit creates a formal/srcu-cbmc directory containing scripts that pull SRCU in from the source code, filter it to remove things that CBMC cannot handle, and run a series of verifications on it. This has a number of shortcomings: 1. It does not yet hook into the upper-level self-test Makefiles. 2. It tests only a single scenario, store buffering. 3. There is no gcc-based syntax-error prefiltering. Nevertheless, it does fully verify a piece of SRCU under a moderately weak memory model (PSO). Signed-off-by: Lance Roy <ldr709@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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