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

Daniel Vetter
2019-08-14T20:20:22Z

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(-)

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2.22.0