config/kernel-blk-fetch-request.m4

   1 dnl #
   2 dnl # 2.6.31 API change
   3 dnl # Request queue peek/retrieval interface cleanup, the blk_fetch_request()
   4 dnl # function replaces the elv_next_request() and blk_fetch_request()
   5 dnl # functions.  The updated blk_fetch_request() function returns the
   6 dnl # next available request and removed it from the request queue.
   7 dnl #
   8 AC_DEFUN([ZFS_AC_KERNEL_BLK_FETCH_REQUEST], [
   9         AC_MSG_CHECKING([whether blk_fetch_request() is available])
  10         tmp_flags="$EXTRA_KCFLAGS"
  11         EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
  12         ZFS_LINUX_TRY_COMPILE([
  13                 #include <linux/blkdev.h>
  14         ],[
  15                 struct request_queue *q = NULL;
  16                 (void) blk_fetch_request(q);
  17         ],[
  18                 AC_MSG_RESULT(yes)
  19                 AC_DEFINE(HAVE_BLK_FETCH_REQUEST, 1,
  20                           [blk_fetch_request() is available])
  21         ],[
  22                 AC_MSG_RESULT(no)
  23         ])
  24         EXTRA_KCFLAGS="$tmp_flags"
  25 ])