config/kernel-blk-queue-io-opt.m4

   1 dnl #
   2 dnl # 2.6.30 API change
   3 dnl # The blk_queue_io_opt() function was added to indicate the optimal
   4 dnl # I/O size for the device.
   5 dnl #
   6 AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT], [
   7         AC_MSG_CHECKING([whether blk_queue_io_opt() is available])
   8         tmp_flags="$EXTRA_KCFLAGS"
   9         EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
  10         ZFS_LINUX_TRY_COMPILE([
  11                 #include <linux/blkdev.h>
  12         ],[
  13                 struct request_queue *q = NULL;
  14                 unsigned int opt = 1;
  15                 (void) blk_queue_io_opt(q, opt);
  16         ],[
  17                 AC_MSG_RESULT(yes)
  18                 AC_DEFINE(HAVE_BLK_QUEUE_IO_OPT, 1,
  19                           [blk_queue_io_opt() is available])
  20         ],[
  21                 AC_MSG_RESULT(no)
  22         ])
  23         EXTRA_KCFLAGS="$tmp_flags"
  24 ])