On Wed, Mar 11, 2020 at 06:36:47PM -0700, Ralph Campbell wrote:
> > @@ -390,8 +384,15 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
> > return -EBUSY;
> > }
> > return hmm_pfns_fill(start, end, range, HMM_PFN_NONE);
> > - } else if (!pmd_present(pmd))
>
From: Jason Gunthorpe
hmm_range_fault() should never return 0 if the caller requested a valid
page, but the pfns output for that page would be HMM_PFN_ERROR.
hmm_pte_need_fault() must always be called before setting HMM_PFN_ERROR to
detect if the page is in faulting mode or not.
Fix two cases
On 3/11/20 11:35 AM, Jason Gunthorpe wrote:
From: Jason Gunthorpe
hmm_range_fault() should never return 0 if the caller requested a valid
page, but the pfns output for that page would be HMM_PFN_ERROR.
hmm_pte_need_fault() must always be called before setting HMM_PFN_ERROR to
detect if the
