On Tue, 2016-03-01 at 10:08 +1100, Cyril Bur wrote:

On Mon, 29 Feb 2016 22:10:13 +1100 (AEDT)
Michael Ellerman [off-list ref] wrote:

quoted

On Mon, 2016-29-02 at 06:29:55 UTC, Suraj Jitindar Singh wrote:

quoted

Both these cases are hard to detect and require manual inspection of
binaries which is unlikely to happen for all tests. Furthermore, LTO
optimisations are not necessary for selftests and correctness is paramount
and as such it is best to disable LTO.

LTO can be enabled on a per test basis.

A pseries_le_defconfig kernel on a POWER8 was used to determine that the
same subset of selftests pass and fail with and without -flto in the
common Makefile.

These tests always fail:
selftests: per_event_excludes [FAIL]
selftests: event_attributes_test [FAIL]
selftests: ebb_vs_cpu_event_test [FAIL]
selftests: cpu_event_vs_ebb_test [FAIL]
selftests: cpu_event_pinned_vs_ebb_test [FAIL]

They shouldn't :)

Are you running as root? Bare metal or guest?

Interesting. I believe this was run baremetal as root. I'm going to test the
patch in qemu at root. Is there a list of expected failures in certain
situations?

Nope.

Most of those require the perf paranoid level to be set, see eg:

  tools/testing/selftests/powerpc/pmu/ebb/cpu_event_vs_ebb_test.c:        SKIP_IF(require_paranoia_below(1));

cheers