On April 05, 2017 3:47 PM Vlastimil Babka wrote: > > The previous patch has shown that simply setting and clearing PF_MEMALLOC in > current->flags can result in wrongly clearing a pre-existing PF_MEMALLOC flag > and potentially lead to recursive reclaim. Let's introduce helpers that support > proper nesting by saving the previous stat of the flag, similar to the existing > memalloc_noio_* and memalloc_nofs_* helpers. Convert existing setting/clearing > of PF_MEMALLOC within mm to the new helpers. > > There are no known issues with the converted code, but the change makes it more > robust. > > Suggested-by: Michal Hocko <mhocko@xxxxxxxx> > Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> > --- Acked-by: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
