> From the walk, it seems we have got the virtual address, can we just send a SIGBUS with it?
If the walk wins the race and the pte for the poisoned page is still valid, then yes.
But we could have:
CPU1 CPU2
memory_failure sets poison
bit for struct page
rmap finds page in task
on CPU2 and sets PTE
to not-valid-poison
memory_failure returns
early because struct page
already marked as poison
walk page tables looking
for mapping - don't find it
-Tony
