On 3/31/20 7:08 AM, Jason Gunthorpe wrote: > I can't think of an easy fix here. > > Andrew, I think this patch has to be dropped :( > > Longpeng can fix the direct bug he saw by not changing the > pXX_offset(), but this extra de-reference will remain some > theortical/rare bug according to the memory model. FWIW, I tested Longpeng's V2 patch without the READ_ONCE for *pgd and *p4d in this environment and it worked fine. -- Mike Kravetz
