[PATCHSET,v3,0/11] Move away from remap_pfn_range()

Message

Jens Axboe March 28, 2024, 11:31 p.m. UTC

Hi,

This series switches both the ring, sqes, and kbuf side away from
using remap_pfn_range().


Patch 1 is just a prep patch, and patches 2-3 add ring support, and
patch 4 just unifies some identical code.

Patches 5-7 cleanup some kbuf side code, and patch 8 prepares buffer
lists to be reference counted, and then patch 9 can finally switch
kbuf to also use the nicer vm_insert_pages(). Patch 10 is a cleanup,
and patch 11 moves the alloc/pin/map etc code into a separate file.

With this, no more remap_pfn_range(), and no more manual cleanup of
having used it.

Changes since v2:
- Simplify references on compound pages (Johannes)
- Fix hunk of one patch being wrong (Jeff)
- Fix typo for !CONFIG_MMU (me)

 include/linux/io_uring_types.h |   4 -
 io_uring/Makefile              |   3 +-
 io_uring/io_uring.c            | 246 +-----------------------
 io_uring/io_uring.h            |   5 -
 io_uring/kbuf.c                | 291 ++++++++--------------------
 io_uring/kbuf.h                |  11 +-
 io_uring/memmap.c              | 333 +++++++++++++++++++++++++++++++++
 io_uring/memmap.h              |  25 +++
 io_uring/rsrc.c                |  37 +---
 mm/nommu.c                     |   7 +
 10 files changed, 467 insertions(+), 495 deletions(-)