config/kernel-blk-queue-max-segments.m4

   1 dnl #
   2 dnl # 2.6.34 API change
   3 dnl # blk_queue_max_segments() consolidates blk_queue_max_hw_segments()
   4 dnl # and blk_queue_max_phys_segments().
   5 dnl #
   6 AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
   7         AC_MSG_CHECKING([whether blk_queue_max_segments() is available])
   8         tmp_flags="$EXTRA_KCFLAGS"
   9         EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
  10         ZFS_LINUX_TRY_COMPILE([
  11                 #include <linux/blkdev.h>
  12         ],[
  13                 struct request_queue *q = NULL;
  14                 (void) blk_queue_max_segments(q, BLK_MAX_SEGMENTS);
  15         ],[
  16                 AC_MSG_RESULT(yes)
  17                 AC_DEFINE(HAVE_BLK_QUEUE_MAX_SEGMENTS, 1,
  18                           [blk_queue_max_segments() is available])
  19         ],[
  20                 AC_MSG_RESULT(no)
  21         ])
  22         EXTRA_KCFLAGS="$tmp_flags"
  23 ])