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dnl #
dnl # 2.6.30 API change
dnl # The blk_queue_physical_block_size() function was introduced to
dnl # indicate the smallest I/O the device can write without incurring
dnl # a read-modify-write penalty.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE], [
AC_MSG_CHECKING([whether blk_queue_physical_block_size() is available])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
struct request_queue *q = NULL;
unsigned short block_size = 1;
(void) blk_queue_physical_block_size(q, block_size);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE, 1,
[blk_queue_physical_block_size() is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
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