[PATCH 0/2] mm/slab: fix lockdep warnings with kmalloc_nolock()

[Harry Yoo <harry.yoo@oracle.com>]

Hi, I've observed a tw lockdep warnings while testing
kmalloc_nolock() in NMI:

  1. Accessing current->mems_allowed_seq seqlock in NMI isn't safe
     and lockdep complains.

  2. w/ CONFIG_SLAB_FREELIST_RANDOM, get_random_u32() acquires
     a local_lock, which isn't safe in NMI and could cause a deadlock.

Let's fix them.

Harry Yoo (2):
  mm/slab: skip get_from_any_partial() if !allow_spin
  mm/slab: use prandom if !allow_spin

 mm/slub.c | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

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2.43.0