diff options
| author | Brian Behlendorf <[email protected]> | 2018-06-19 21:52:45 -0700 |
|---|---|---|
| committer | GitHub <[email protected]> | 2018-06-19 21:52:45 -0700 |
| commit | 1c38ac61e1dbc876eb4079a69f965bb51635fef7 (patch) | |
| tree | fa0f3df41fdc4a801494bd61f885ecb6ba47d724 /include/linux | |
| parent | 6413c95fbd88dc06ae57e50398b8530a17d0c7d3 (diff) | |
Linux 4.14 compat: blk_queue_stackable()
The blk_queue_stackable() function was replaced in the 4.14 kernel
by queue_is_rq_based(), commit torvalds/linux@5fdee212. This change
resulted in the default elevator being used which can negatively
impact performance.
Rather than adding additional compatibility code to detect the
new interface unconditionally attempt to set the elevator. Since
we expect this to fail for block devices without an elevator the
error message has been moved in to zfs_dbgmsg().
Finally, it was observed that the elevator_change() was removed
from the 4.12 kernel, commit torvalds/linux@c033269. Update the
comment to clearly specify which are expected to export the
elevator_change() symbol.
Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed-by: Tony Hutter <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #7645
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blkdev_compat.h | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h index 27a4743c0..88b0e48cd 100644 --- a/include/linux/blkdev_compat.h +++ b/include/linux/blkdev_compat.h @@ -107,17 +107,6 @@ blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua) #endif /* - * 2.6.27 API change, - * The blk_queue_stackable() queue flag was added in 2.6.27 to handle dm - * stacking drivers. Prior to this request stacking drivers were detected - * by checking (q->request_fn == NULL), for earlier kernels we revert to - * this legacy behavior. - */ -#ifndef blk_queue_stackable -#define blk_queue_stackable(q) ((q)->request_fn == NULL) -#endif - -/* * 2.6.34 API change, * The blk_queue_max_hw_sectors() function replaces blk_queue_max_sectors(). */ |