Re: [PATCH 0/2] Support direct I/O read and write for memory allocated by dmabuf

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Am 10.07.24 um 15:57 schrieb Lei Liu:
Use vm_insert_page to establish a mapping for the memory allocated
by dmabuf, thus supporting direct I/O read and write; and fix the
issue of incorrect memory statistics after mapping dmabuf memory.

Well big NAK to that! Direct I/O is intentionally disabled on DMA-bufs.

We already discussed enforcing that in the DMA-buf framework and this patch probably means that we should really do that.

Regards,
Christian.


Lei Liu (2):
   mm: dmabuf_direct_io: Support direct_io for memory allocated by dmabuf
   mm: dmabuf_direct_io: Fix memory statistics error for dmabuf allocated
     memory with direct_io support

  drivers/dma-buf/heaps/system_heap.c |  5 +++--
  fs/proc/task_mmu.c                  |  8 +++++++-
  include/linux/mm.h                  |  1 +
  mm/memory.c                         | 15 ++++++++++-----
  mm/rmap.c                           |  9 +++++----
  5 files changed, 26 insertions(+), 12 deletions(-)






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