zfs/config/kernel-generic_io_acct.m4

   1 dnl #
   2 dnl # 3.19 API addition
   3 dnl #
   4 dnl # torvalds/linux@394ffa503bc40e32d7f54a9b817264e81ce131b4 allows us to
   5 dnl # increment iostat counters without generic_make_request().
   6 dnl #
   7 AC_DEFUN([ZFS_AC_KERNEL_GENERIC_IO_ACCT], [
   8         AC_MSG_CHECKING([whether generic IO accounting symbols are avaliable])
   9         ZFS_LINUX_TRY_COMPILE_SYMBOL([
  10                 #include <linux/bio.h>
  11
  12                 void (*generic_start_io_acct_f)(int, unsigned long,
  13                     struct hd_struct *) = &generic_start_io_acct;
  14                 void (*generic_end_io_acct_f)(int, struct hd_struct *,
  15                     unsigned long) = &generic_end_io_acct;
  16         ], [
  17                 generic_start_io_acct(0, 0, NULL);
  18                 generic_end_io_acct(0, NULL, 0);
  19         ], [generic_start_io_acct], [block/bio.c], [
  20                 AC_MSG_RESULT(yes)
  21                 AC_DEFINE(HAVE_GENERIC_IO_ACCT, 1,
  22                     [generic_start_io_acct()/generic_end_io_acct() avaliable])
  23         ], [
  24                 AC_MSG_RESULT(no)
  25         ])
  26 ])