config/kernel-blk-rq-bytes.m4

   1 dnl #
   2 dnl # 2.6.29 API change
   3 dnl # In the 2.6.29 kernel blk_rq_bytes() was available as a GPL-only symbol.
   4 dnl # So we need to check the symbol license as well.  As of 2.6.31 the
   5 dnl blk_rq_bytes() helper was changed to a static inline which we can use.
   6 dnl #
   7 AC_DEFUN([ZFS_AC_KERNEL_BLK_RQ_BYTES], [
   8         AC_MSG_CHECKING([whether blk_rq_bytes() is available])
   9         ZFS_LINUX_TRY_COMPILE([
  10                 #include <linux/blkdev.h>
  11         ],[
  12                 struct request *req = NULL;
  13                 (void) blk_rq_bytes(req);
  14         ],[
  15                 AC_MSG_RESULT(yes)
  16                 AC_DEFINE(HAVE_BLK_RQ_BYTES, 1,
  17                           [blk_rq_bytes() is available])
  18         ],[
  19                 AC_MSG_RESULT(no)
  20         ])
  21
  22         AC_MSG_CHECKING([whether blk_rq_bytes() is GPL-only])
  23         ZFS_LINUX_TRY_COMPILE([
  24                 #include <linux/module.h>
  25                 #include <linux/blkdev.h>
  26
  27                 MODULE_LICENSE("CDDL");
  28         ],[
  29                 struct request *req = NULL;
  30                 (void) blk_rq_bytes(req);
  31         ],[
  32                 AC_MSG_RESULT(no)
  33         ],[
  34                 AC_MSG_RESULT(yes)
  35                 AC_DEFINE(HAVE_BLK_RQ_BYTES_GPL_ONLY, 1,
  36                           [blk_rq_bytes() is GPL-only])
  37         ])
  38 ])