objtool/klp: Give each run one working directory, one per test inside it

Each test made its own mktemp directory, so a run scattered them through
/tmp among everything else using the same names, and there was no way to
inspect what a failing test built -- the objects are gone the moment it
exits, which is right every time but the one that matters.

Give the run one directory and each test a subdirectory of it, named for
the test and nested the way the source is:

  /tmp/klp-tests.3zC6oyfd/
    generic/test-basic/{orig.o,patched.o,out.o,Module.symvers,...}
    x86/test-kcfi/...

--keep then reports one path instead of forty, and removing it is one
command.  A test run by hand still falls back to a temp directory of its
own, and still says where that went.

Detecting a leak comes free.  Cleanup is now "remove each test's directory,
then rmdir the run's", and the rmdir fails if anything is left -- so a test
which dies without running its own cleanup is reported rather than quietly
leaving something behind.

preflight names the directory the tests build under, since mktemp honours
TMPDIR and a run in a container is otherwise silent about where its work
went.  The runner says what to do only when it is relevant: on a failure
without --keep, that the option exists; with it, how many directories are
waiting.  Usage text is not read while something is broken.

Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Assisted-by: Claude:claude-opus-5
Link: https://patch.msgid.link/20260916184351.2720310-8-song@kernel.org

0 files changed, 0 insertions, 0 deletions