lkml.org 
[lkml]   [2020]   [Nov]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v5 05/15] mm/frame-vector: Use FOLL_LONGTERM
    On Thu, Nov 05, 2020 at 10:25:24AM +0100, Daniel Vetter wrote:
    > > /*
    > > * If we can't determine whether or not a pte is special, then fail immediately
    > > * for ptes. Note, we can still pin HugeTLB and THP as these are guaranteed not
    > > * to be special.
    > > *
    > > * For a futex to be placed on a THP tail page, get_futex_key requires a
    > > * get_user_pages_fast_only implementation that can pin pages. Thus it's still
    > > * useful to have gup_huge_pmd even if we can't operate on ptes.
    > > */
    >
    > We support hugepage faults in gpu drivers since recently, and I'm not
    > seeing a pud_mkhugespecial anywhere. So not sure this works, but probably
    > just me missing something again.

    It means ioremap can't create an IO page PUD, it has to be broken up.

    Does ioremap even create anything larger than PTEs?

    Jason

    \
     
     \ /
      Last update: 2020-11-05 13:50    [W:8.642 / U:0.164 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site