[PATCH 0/3] sched: migrate_disable() vs per-CPU access safety checks

[Valentin Schneider]

Hi folks,

I've hit a few warnings when taking v5.13-rt1 out for a spin on my arm64
Juno. Those are due to regions that become preemptible under PREEMPT_RT, but
remain safe wrt per-CPU accesses due to migrate_disable() + a sleepable lock.

This adds a helper that looks at not just preemptability but also affinity and
migrate disable, and plasters the warning sites.

Cheers,
Valentin

Valentin Schneider (3):
  sched: Introduce is_pcpu_safe()
  rcu/nocb: Check for migratability rather than pure preemptability
  arm64: mm: Make arch_faults_on_old_pte() check for migratability

 arch/arm64/include/asm/pgtable.h |  2 +-
 include/linux/sched.h            | 10 ++++++++++
 kernel/rcu/tree_plugin.h         |  3 +--
 3 files changed, 12 insertions(+), 3 deletions(-)

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2.25.1