[0/1] Fix objects remain in the offline per-cpu quarantine

Message

Kuan-Ying Lee (李冠穎) Nov. 12, 2020, 6:24 a.m. UTC

This patch fixes object remain in the offline per-cpu quarantine as
describe below.

Free objects will get into per-cpu quarantine if enable generic KASAN.
If a cpu is offline and users use kmem_cache_destroy, kernel will detect
objects still remain in the offline per-cpu quarantine and report error.

Register a cpu hotplug function to remove all objects in the offline
per-cpu quarantine when cpu is going offline. Set a per-cpu variable
to indicate this cpu is offline.

Kuan-Ying Lee (1):
  kasan: fix object remain in offline per-cpu quarantine

 mm/kasan/quarantine.c | 59 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)