[0/5] hmm & mmu_notifier debug/lockdep annotations

Message

Daniel Vetter Aug. 14, 2019, 8:20 p.m. UTC

Hi all (but I guess mostly Jason),

Finally gotten around to rebasing the previous version, fixing the rebase
fail in there, update the commit message a bit and give this a spin with
some tests. Nicely caught a lockdep splat that we're now discussing in
i915, and seems to not have misfired anywhere else (including a few oom).

Review, comments and everything very much appreciated. Plus I'd really
like to land this, there's more hmm_mirror users in-flight, and I've seen
some that get things wrong which this patchset should catch.

Thanks, Daniel

Daniel Vetter (5):
  mm: Check if mmu notifier callbacks are allowed to fail
  kernel.h: Add non_block_start/end()
  mm, notifier: Catch sleeping/blocking for !blockable
  mm, notifier: Add a lockdep map for invalidate_range_start
  mm/hmm: WARN on illegal ->sync_cpu_device_pagetables errors

 include/linux/kernel.h       | 10 +++++++++-
 include/linux/mmu_notifier.h |  6 ++++++
 include/linux/sched.h        |  4 ++++
 kernel/sched/core.c          | 19 ++++++++++++++-----
 mm/hmm.c                     |  3 +++
 mm/mmu_notifier.c            | 17 ++++++++++++++++-
 6 files changed, 52 insertions(+), 7 deletions(-)