mirror of https://github.com/openzfs/zfs.git
26 lines
765 B
Plaintext
26 lines
765 B
Plaintext
dnl #
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dnl # 2.6.27 API change
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dnl # The blk_queue_nonrot() function and QUEUE_FLAG_NONROT flag were
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dnl # added so non-rotational devices could be identified. These devices
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dnl # have no seek time which the higher level elevator uses to optimize
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dnl # how the I/O issued to the device.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_NONROT], [
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AC_MSG_CHECKING([whether blk_queue_nonrot() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/blkdev.h>
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],[
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struct request_queue *q = NULL;
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(void) blk_queue_nonrot(q);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_NONROT, 1,
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[blk_queue_nonrot() is available])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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