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Commit | Line | Data |
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34037afe ED |
1 | dnl # |
2 | dnl # 2.6.27 API change | |
3 | dnl # The blk_queue_nonrot() function and QUEUE_FLAG_NONROT flag were | |
4 | dnl # added so non-rotational devices could be identified. These devices | |
5 | dnl # have no seek time which the higher level elevator uses to optimize | |
6 | dnl # how the I/O issued to the device. | |
7 | dnl # | |
8 | AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_NONROT], [ | |
9 | AC_MSG_CHECKING([whether blk_queue_nonrot() is available]) | |
10 | tmp_flags="$EXTRA_KCFLAGS" | |
11 | EXTRA_KCFLAGS="-Wno-unused-but-set-variable" | |
12 | ZFS_LINUX_TRY_COMPILE([ | |
13 | #include <linux/blkdev.h> | |
14 | ],[ | |
15 | struct request_queue *q = NULL; | |
16 | (void) blk_queue_nonrot(q); | |
17 | ],[ | |
18 | AC_MSG_RESULT(yes) | |
19 | AC_DEFINE(HAVE_BLK_QUEUE_NONROT, 1, | |
20 | [blk_queue_nonrot() is available]) | |
21 | ],[ | |
22 | AC_MSG_RESULT(no) | |
23 | ]) | |
24 | EXTRA_KCFLAGS="$tmp_flags" | |
25 | ]) |