config/kernel-rwsem.m4

   1 dnl #
   2 dnl # 3.16 API Change
   3 dnl #
   4 dnl # rwsem-spinlock "->activity" changed to "->count"
   5 dnl #
   6 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM_ACTIVITY], [
   7         ZFS_LINUX_TEST_SRC([rwsem_activity], [
   8                 #include <linux/rwsem.h>
   9         ],[
  10                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
  11                 dummy_semaphore.activity = 0;
  12         ])
  13 ])
  14
  15 AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ACTIVITY], [
  16         AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
  17         ZFS_LINUX_TEST_RESULT([rwsem_activity], [
  18                 AC_MSG_RESULT(yes)
  19                 AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1,
  20                     [struct rw_semaphore has member activity])
  21         ],[
  22                 AC_MSG_RESULT(no)
  23         ])
  24 ])
  25
  26 dnl #
  27 dnl # 4.8 API Change
  28 dnl #
  29 dnl # rwsem "->count" changed to atomic_long_t type
  30 dnl #
  31 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM_ATOMIC_LONG_COUNT], [
  32         ZFS_LINUX_TEST_SRC([rwsem_atomic_long_count], [
  33                 #include <linux/rwsem.h>
  34         ],[
  35                 DECLARE_RWSEM(dummy_semaphore);
  36                 (void) atomic_long_read(&dummy_semaphore.count);
  37         ])
  38 ])
  39
  40 AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ATOMIC_LONG_COUNT], [
  41         AC_MSG_CHECKING(
  42             [whether struct rw_semaphore has atomic_long_t member count])
  43         ZFS_LINUX_TEST_RESULT([rwsem_atomic_long_count], [
  44                 AC_MSG_RESULT(yes)
  45                 AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1,
  46                     [struct rw_semaphore has atomic_long_t member count])
  47         ],[
  48                 AC_MSG_RESULT(no)
  49         ])
  50 ])
  51
  52 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM], [
  53         ZFS_AC_KERNEL_SRC_RWSEM_ACTIVITY
  54         ZFS_AC_KERNEL_SRC_RWSEM_ATOMIC_LONG_COUNT
  55 ])
  56
  57 AC_DEFUN([ZFS_AC_KERNEL_RWSEM], [
  58         ZFS_AC_KERNEL_RWSEM_ACTIVITY
  59         ZFS_AC_KERNEL_RWSEM_ATOMIC_LONG_COUNT
  60 ])