On Fri, Jul 12, 2024 at 9:44 AM Łukasz Bartosik <ukaszb@xxxxxxxxxxxx> wrote: > > On Wed, Jul 3, 2024 at 12:14 AM <jim.cromie@xxxxxxxxx> wrote: > > > > On Tue, Jul 2, 2024 at 4:01 PM Luis Chamberlain <mcgrof@xxxxxxxxxx> wrote: > > > > > > On Tue, Jul 02, 2024 at 03:56:50PM -0600, Jim Cromie wrote: > > > > This fixes dynamic-debug support for DRM.debug, added via classmaps. > > > > commit bb2ff6c27bc9 (drm: Disable dynamic debug as broken) > > > > > > > > CONFIG_DRM_USE_DYNAMIC_DEBUG=y was marked broken because drm.debug=val > > > > was applied when drm.ko was modprobed; too early for the yet-to-load > > > > drivers, which thus missed the enablement. My testing with > > > > /etc/modprobe.d/ entries and modprobes with dyndbg=$querycmd options > > > > obscured this omission. > > > > > > > > The fix is to replace invocations of DECLARE_DYNDBG_CLASSMAP with > > > > DYNDBG_CLASSMAP_DEFINE for core, and DYNDBG_CLASSMAP_USE for drivers. > > > > The distinction allows dyndbg to also handle the users properly. > > > > > > > > DRM is the only current classmaps user, and is not really using it, > > > > so if you think DRM could benefit from zero-off-cost debugs based on > > > > static-keys, please test. > > > > > > > > HISTORY > > > > > > > > 9/4/22 - ee879be38bc8..ace7c4bbb240 commited - classmaps-v1 dyndbg parts > > > > 9/11/22 - 0406faf25fb1..16deeb8e18ca commited - classmaps-v1 drm parts > > > > > > > > https://lore.kernel.org/lkml/Y3XUrOGAV4I7bB3M@xxxxxxxxx/ > > > > greg k-h says: > > > > This should go through the drm tree now. The rest probably should also > > > > go that way and not through my tree as well. > > > > > > Can't this just be defined as a coccinelle smpl patch? Must easier > > > to read than 53 patches? > > > > > > > perhaps it could - Im not sure that would be easier to review > > than a file-scoped struct declaration or reference per driver > > > > Also, I did it hoping to solicit more Tested-by:s with drm.debug=0x1ff > > > > Jim > > > > Jim, > > When testing different combinations of Y/M for TEST_DYNAMIC_DEBUG and > TEST_DYNAMIC_DEBUG_SUBMOD in virtme-ng I spotted test failures: > > When the TEST_DYNAMIC_DEBUG=M and TEST_DYNAMIC_DEBUG_SUBMOD=M - > BASIC_TESTS, COMMA_TERMINATOR_TESTS, TEST_PERCENT_SPLITTING, > TEST_MOD_SUBMOD selftests passed > When the TEST_DYNAMIC_DEBUG=Y and TEST_DYNAMIC_DEBUG_SUBMOD=M - > BASIC_TESTS, COMMA_TERMINATOR_TESTS selftests passed, however > TEST_PERCENT_SPLITTING selftest fails with ": ./dyndbg_selftest.sh:270 > check failed expected 1 on =pf, got 0" > When the TEST_DYNAMIC_DEBUG=Y and TEST_DYNAMIC_DEBUG_SUBMOD=Y - > BASIC_TESTS, COMMA_TERMINATOR_TESTS selftests passed, however > TEST_PERCENT_SPLITTING selftest fails also with ": > ./dyndbg_selftest.sh:270 check failed expected 1 on =pf, got 0" > > Have I missed something ? > I am not seeing those 2 failures on those 2 configs. most of my recent testing has been on x86-defconfig + minimals, built and run using/inside virtme-ng the last kernel I installed on this hw was june 16, I will repeat that, and report soon if I see the failure outside the vm I'll also send you my script, to maybe speed isolation of the differences. > Thanks, > Lukasz > > > > Luis > > >
