lkml.org 
[lkml]   [2018]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 0/5] mm: rework hmm to use devm_memremap_pages
    On Wed, May 23, 2018 at 08:18:11PM -0700, Dan Williams wrote:
    > On Wed, May 23, 2018 at 5:10 PM, Jerome Glisse <jglisse@redhat.com> wrote:
    > > On Mon, May 21, 2018 at 03:35:14PM -0700, Dan Williams wrote:
    > >> Hi Andrew, please consider this series for 4.18.
    > >>
    > >> For maintainability, as ZONE_DEVICE continues to attract new users,
    > >> it is useful to keep all users consolidated on devm_memremap_pages() as
    > >> the interface for create "device pages".
    > >>
    > >> The devm_memremap_pages() implementation was recently reworked to make
    > >> it more generic for arbitrary users, like the proposed peer-to-peer
    > >> PCI-E enabling. HMM pre-dated this rework and opted to duplicate
    > >> devm_memremap_pages() as hmm_devmem_pages_create().
    > >>
    > >> Rework HMM to be a consumer of devm_memremap_pages() directly and fix up
    > >> the licensing on the exports given the deep dependencies on the mm.
    > >
    > > I am on PTO right now so i won't be able to quickly review it all
    > > but forcing GPL export is problematic for me now. I rather have
    > > device driver using "sane" common helpers than creating their own
    > > crazy thing.
    >
    > Sane drivers that need this level of deep integration with Linux
    > memory management need to be upstream. Otherwise, HMM is an
    > unprecedented departure from the norms of Linux kernel development.

    Agreed. I consider every driver using this a derived work, independ
    on the marking or not. And I'm willing to enforce this.

    \
     
     \ /
      Last update: 2018-05-24 08:30    [W:4.154 / U:0.036 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site