[PATCH v2 0/5] Enable testing small DMA segment sizes

[Bart Van Assche <bvanassche@acm.org>]

Hi Jens,

About one year ago support was merged for DMA segment sizes smaller than the
virtual memory page size. No blktests exist yet for the new codepaths related
to small segment size support. This patch series makes it possible to test
these code paths on a system (e.g. a VM) with 4 KiB pages.

The corresponding blktest patch is available here:
https://lore.kernel.org/linux-block/20260323200751.1238583-1-bvanassche@acm.org/

Please consider this patch series for the next merge window.

Changes compared to v1:
 - Addressed Damien's comment and made the null_blk kernel module parameter more
   clear.
 - Added three patches to this series: one patch that fixes a source code
   comment and two patches that reduce the number of users of the
   BLK_MIN_SEGMENT_SIZE constant.

Bart Van Assche (5):
  block: Fix a source code comment
  block: Fix the max_user_sectors lower bound
  block: Remove a DMA segment boundary mask check
  block: Reduce the minimum value for the maximum DMA segment size
  null_blk: Support configuring the maximum DMA segment size

 block/blk-settings.c              | 14 ++++----------
 block/blk.h                       |  2 +-
 drivers/block/null_blk/main.c     | 13 +++++++++++++
 drivers/block/null_blk/null_blk.h |  1 +
 4 files changed, 19 insertions(+), 11 deletions(-)