config/kernel-blk-end-request.m4

   1 dnl #
   2 dnl # 2.6.31 API change
   3 dnl # In 2.6.29 kernels blk_end_request() was a GPL-only symbol, this was
   4 dnl # changed in 2.6.31 so it may be used by non-GPL modules.
   5 dnl #
   6 AC_DEFUN([ZFS_AC_KERNEL_BLK_END_REQUEST], [
   7         AC_MSG_CHECKING([whether blk_end_request() is available])
   8         tmp_flags="$EXTRA_KCFLAGS"
   9         EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
  10         ZFS_LINUX_TRY_COMPILE([
  11                 #include <linux/blkdev.h>
  12         ],[
  13                 struct request *req = NULL;
  14                 (void) blk_end_request(req, 0, 0);
  15         ],[
  16                 AC_MSG_RESULT(yes)
  17                 AC_DEFINE(HAVE_BLK_END_REQUEST, 1,
  18                           [blk_end_request() is available])
  19         ],[
  20                 AC_MSG_RESULT(no)
  21         ])
  22
  23         AC_MSG_CHECKING([whether blk_end_request() is GPL-only])
  24         ZFS_LINUX_TRY_COMPILE([
  25                 #include <linux/module.h>
  26                 #include <linux/blkdev.h>
  27
  28                 MODULE_LICENSE("CDDL");
  29         ],[
  30                 struct request *req = NULL;
  31                 (void) blk_end_request(req, 0, 0);
  32         ],[
  33                 AC_MSG_RESULT(no)
  34         ],[
  35                 AC_MSG_RESULT(yes)
  36                 AC_DEFINE(HAVE_BLK_END_REQUEST_GPL_ONLY, 1,
  37                           [blk_end_request() is GPL-only])
  38         ])
  39         EXTRA_KCFLAGS="$tmp_flags"
  40 ])