26 lines
793 B
Plaintext
26 lines
793 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_physical_block_size() function was introduced to
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dnl # indicate the smallest I/O the device can write without incurring
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dnl # a read-modify-write penalty.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE], [
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AC_MSG_CHECKING([whether blk_queue_physical_block_size() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/blkdev.h>
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],[
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struct request_queue *q = NULL;
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unsigned short block_size = 1;
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(void) blk_queue_physical_block_size(q, block_size);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE, 1,
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[blk_queue_physical_block_size() is available])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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