projects / mirror_zfs-debian.git / blame
| Commit | Line | Data |
|---|---|---|
| b18019d2 ED |
1 | dnl # |
| 2 | dnl # 2.6.36 API change | |
| 3 | dnl # In 2.6.36 kernels the blk_queue_ordered() interface has been | |
| 4 | dnl # replaced by the simpler blk_queue_flush(). However, while the | |
| 5 | dnl # old interface was available to all the new one is GPL-only. | |
| 6 | dnl # Thus in addition to detecting if this function is available | |
| 7 | dnl # we determine if it is GPL-only. If the GPL-only interface is | |
| 8 | dnl # there we implement our own compatibility function, otherwise | |
| 9 | dnl # we use the function. The hope is that long term this function | |
| 10 | dnl # will be opened up. | |
| 11 | dnl # | |
| 12 | AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLUSH], [ | |
| 13 | AC_MSG_CHECKING([whether blk_queue_flush() is available]) | |
| 14 | tmp_flags="$EXTRA_KCFLAGS" | |
| 15 | EXTRA_KCFLAGS="-Wno-unused-but-set-variable" | |
| 16 | ZFS_LINUX_TRY_COMPILE([ | |
| 17 | #include <linux/blkdev.h> | |
| 18 | ],[ | |
| 19 | struct request_queue *q = NULL; | |
| 20 | (void) blk_queue_flush(q, REQ_FLUSH); | |
| 21 | ],[ | |
| 22 | AC_MSG_RESULT(yes) | |
| 23 | AC_DEFINE(HAVE_BLK_QUEUE_FLUSH, 1, | |
| 24 | [blk_queue_flush() is available]) | |
| 25 | ],[ | |
| 26 | AC_MSG_RESULT(no) | |
| 27 | ]) | |
| 28 | ||
| 29 | AC_MSG_CHECKING([whether blk_queue_flush() is GPL-only]) | |
| 30 | ZFS_LINUX_TRY_COMPILE([ | |
| 31 | #include <linux/module.h> | |
| 32 | #include <linux/blkdev.h> | |
| 33 | ||
| 34 | MODULE_LICENSE("CDDL"); | |
| 35 | ],[ | |
| 36 | struct request_queue *q = NULL; | |
| 37 | (void) blk_queue_flush(q, REQ_FLUSH); | |
| 38 | ],[ | |
| 39 | AC_MSG_RESULT(no) | |
| 40 | ],[ | |
| 41 | AC_MSG_RESULT(yes) | |
| 42 | AC_DEFINE(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY, 1, | |
| 43 | [blk_queue_flush() is GPL-only]) | |
| 44 | ]) | |
| 45 | EXTRA_KCFLAGS="$tmp_flags" | |
| 46 | ]) |