diff options
| author | Dan Williams <[email protected]> | 2017-10-23 17:24:45 +0000 |
|---|---|---|
| committer | Dan Williams <[email protected]> | 2017-11-15 00:49:06 +0000 |
| commit | 7a862fbbdec665190c5ef298c0c6ec9f3915cf45 (patch) | |
| tree | 78f3f86aa6545576fbcfb4188169f484865b0fed /lib/dma-debug.c | |
| parent | dax: quiet bdev_dax_supported() (diff) | |
| download | kernel-7a862fbbdec665190c5ef298c0c6ec9f3915cf45.tar.gz kernel-7a862fbbdec665190c5ef298c0c6ec9f3915cf45.zip | |
brd: remove dax support
DAX support in brd is awkward because its backing page frames are
distinct from the ones provided by pmem, dcssblk, or axonram. We need
pfn_t_devmap() entries to fully support DAX, and the limited DAX support
for pfn_t_special() page frames is not interesting for brd when pmem is
already a superset of brd. Lastly, brd is the only dax capable driver
that may sleep in its ->direct_access() implementation. So it causes a
global burden with no net gain of kernel functionality.
For all these reasons, remove DAX support.
Cc: Jens Axboe <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Ross Zwisler <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Diffstat (limited to 'lib/dma-debug.c')
0 files changed, 0 insertions, 0 deletions