On Thu, Aug 15, 2019 at 08:52:56PM +0000, Yang, Philip wrote: > hmm_range_fault may return NULL pages because some of pfns are equal to > HMM_PFN_NONE. This happens randomly under memory pressure. The reason is > for swapped out page pte path, hmm_vma_handle_pte doesn't update fault > variable from cpu_flags, so it failed to call hmm_vam_do_fault to swap > the page in. > > The fix is to call hmm_pte_need_fault to update fault variable. > Change-Id: I2e8611485563d11d938881c18b7935fa1e7c91ee I'll fix it for you but please be careful not to send Change-id's to the public lists. Also what is the Fixes line for this? > Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx> > mm/hmm.c | 3 +++ > 1 file changed, 3 insertions(+) Ralph has also been looking at this area also so I'll give him a bit to chime in, otherwise with Jerome's review this looks OK to go to linux-next Thanks, Jason
