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The --per-test-log option currently hard-codes /tmp. However, the system under test will most likely have tmpfs mounted there. Since it's not clear which filenames the log files will have, the user should be able to specify a persistent directory to store the logs. Keeping those logs are important because the run_kselftest.sh runner will only yield KTAP output, trimming information that is otherwise available through running individual tests directly. Allow --per-test-log to take an optional directory argument. Keep the existing behaviour when the option is passed without an argument, but if a directory is provided, create it if needed, reject non-directory paths and non-writable directories, canonicalize it, and have runner.sh write per-test logs there instead of /tmp. This also makes relative paths safe by resolving them before the runner changes into a collection directory. Signed-off-by: Ricardo B. Marlière <rbm@suse.com> Link: https://lore.kernel.org/r/20260320-selftests-fixes-v1-4-79144f76be01@suse.com Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>