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25 lines
640 B
Plaintext
25 lines
640 B
Plaintext
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dnl #
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dnl # 2.6.30 API change
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dnl # The blk_queue_io_opt() function was added to indicate the optimal
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dnl # I/O size for the device.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT], [
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AC_MSG_CHECKING([whether blk_queue_io_opt() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/blkdev.h>
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],[
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struct request_queue *q = NULL;
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unsigned int opt = 1;
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(void) blk_queue_io_opt(q, opt);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_IO_OPT, 1,
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[blk_queue_io_opt() is available])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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