linux-dev/tools/testing/selftests/rcutorture, branch linus/master

Merge branches 'docs.2022.04.20a', 'fixes.2022.04.20a', 'nocb.2022.04.11b', 'rcu-tasks.2022.04.11b', 'srcu.2022.05.03a', 'torture.2022.04.11b', 'torture-tasks.2022.04.20a' and 'torturescript.2022.04.20a' into HEAD

2022-05-03T17:21:40Z

docs.2022.04.20a: Documentation updates. fixes.2022.04.20a: Miscellaneous fixes. nocb.2022.04.11b: Callback-offloading updates. rcu-tasks.2022.04.11b: RCU-tasks updates. srcu.2022.05.03a: Put SRCU on a memory diet. torture.2022.04.11b: Torture-test updates. torture-tasks.2022.04.20a: Avoid torture testing changing RCU configuration. torturescript.2022.04.20a: Torture-test scripting updates.

rcutorture: Make torture.sh allow for --kasan

2022-04-20T23:55:03Z

The torture.sh script provides extra memory for scftorture and rcuscale. However, the total memory provided is only 1G, which is less than the 2G that is required for KASAN testing. This commit therefore ups the torture.sh script's 1G to 2G. Signed-off-by: Paul E. McKenney

rcutorture: Make torture.sh refscale and rcuscale specify Tasks Trace RCU

2022-04-20T23:55:03Z

Now that the Tasks RCU flavors are selected by their users rather than by the rcutorture scenarios, torture.sh fails when attempting to run NOPREEMPT scenarios for refscale and rcuscale. This commit therefore makes torture.sh specify CONFIG_TASKS_TRACE_RCU=y to avoid such failure. Why not also CONFIG_TASKS_RCU? Because tracing selects this one. Signed-off-by: Paul E. McKenney

rcutorture: Make kvm.sh allow more memory for --kasan runs

2022-04-20T23:55:03Z

KASAN allots significant memory to track allocation state, and the amount of memory has increased recently, which results in frequent OOMs on a few of the rcutorture scenarios. This commit therefore provides 2G of memory for --kasan runs, up from the 512M default. Signed-off-by: Paul E. McKenney

torture: Save "make allmodconfig" .config file

2022-04-20T23:55:03Z

Currently, torture.sh saves only the build output and exit code from the "make allmodconfig" test. This commit also saves the .config file. Signed-off-by: Paul E. McKenney

scftorture: Remove extraneous "scf" from per_version_boot_params

2022-04-20T23:55:03Z

There is an extraneous "scf" in the per_version_boot_params shell function used by scftorture. No harm done in that it is just passed as an argument to the /init program in initrd, but this commit nevertheless removes it. Signed-off-by: Paul E. McKenney

rcutorture: Adjust scenarios' Kconfig options for CONFIG_PREEMPT_DYNAMIC

2022-04-20T23:55:03Z

Now that CONFIG_PREEMPT_DYNAMIC=y is the default, kernels that are ostensibly built with CONFIG_PREEMPT_NONE=y or CONFIG_PREEMPT_VOLUNTARY=y are now actually built with CONFIG_PREEMPT=y, but are by default booted so as to disable preemption. Although this allows much more flexibility from a single kernel binary, it means that the current rcutorture scenarios won't find build errors that happen only when preemption is fully disabled at build time. This commit therefore adds CONFIG_PREEMPT_DYNAMIC=n to several scenarios, and while in the area switches one from CONFIG_PREEMPT_NONE=y to CONFIG_PREEMPT_VOLUNTARY=y to add coverage of this Kconfig option. Signed-off-by: Paul E. McKenney

torture: Enable CSD-lock stall reports for scftorture

2022-04-20T23:55:03Z

This commit passes the csdlock_debug=1 kernel parameter in order to enable CSD-lock stall reports for torture.sh scftorure runs. Signed-off-by: Paul E. McKenney

torture: Skip vmlinux check for kvm-again.sh runs

2022-04-20T23:54:56Z

The kvm-again.sh script reruns an previously built set of kernels, so the vmlinux files are associated with that previous run, not this on. This results in kvm-find_errors.sh reporting spurious failed-build errors. This commit therefore omits the vmlinux check for kvm-again.sh runs. Signed-off-by: Paul E. McKenney

scftorture: Adjust for TASKS_RCU Kconfig option being selected

2022-04-20T23:53:19Z

This commit adjusts the scftorture PREEMPT and NOPREEMPT scenarios to account for the TASKS_RCU Kconfig option being explicitly selected rather than computed in isolation. Signed-off-by: Paul E. McKenney