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[ Upstream commit 8f15c682ac5a778feb8e343f9057b89beb40d85b ] The rcutorture scripts currently expect the user to create the tools/testing/selftests/rcutorture/initrd directory. Should the user fail to do this, the kernel build will fail with obscure and confusing error messages. This commit therefore adds explicit checks for the tools/testing/selftests/rcutorture/initrd directory, and if not present, creates one on systems on which dracut is installed. If this directory could not be created, a less obscure error message is emitted and the test is aborted. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Connor Shu <Connor.Shu@ibm.com> [ paulmck: Adapt the script to fit into the rcutorture framework and severely abbreviate the initrd/init script. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>