config/kernel-rwsem.m4

   1 dnl #
   2 dnl # 3.1 API Change
   3 dnl #
   4 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
   5 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
   6 dnl #
   7 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM_SPINLOCK_IS_RAW], [
   8         ZFS_LINUX_TEST_SRC([rwsem_spinlock_is_raw], [
   9                 #include <linux/rwsem.h>
  10         ],[
  11                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
  12                 raw_spinlock_t dummy_lock __attribute__ ((unused)) =
  13                     __RAW_SPIN_LOCK_INITIALIZER(dummy_lock);
  14                 dummy_semaphore.wait_lock = dummy_lock;
  15         ])
  16 ])
  17
  18 AC_DEFUN([ZFS_AC_KERNEL_RWSEM_SPINLOCK_IS_RAW], [
  19         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
  20         ZFS_LINUX_TEST_RESULT([rwsem_spinlock_is_raw], [
  21                 AC_MSG_RESULT(yes)
  22         ],[
  23                 ZFS_LINUX_TEST_ERROR([rwsem_spinlock_is_raw])
  24         ])
  25 ])
  26
  27 dnl #
  28 dnl # 3.16 API Change
  29 dnl #
  30 dnl # rwsem-spinlock "->activity" changed to "->count"
  31 dnl #
  32 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM_ACTIVITY], [
  33         ZFS_LINUX_TEST_SRC([rwsem_activity], [
  34                 #include <linux/rwsem.h>
  35         ],[
  36                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
  37                 dummy_semaphore.activity = 0;
  38         ])
  39 ])
  40
  41 AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ACTIVITY], [
  42         AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
  43         ZFS_LINUX_TEST_RESULT([rwsem_activity], [
  44                 AC_MSG_RESULT(yes)
  45                 AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1,
  46                     [struct rw_semaphore has member activity])
  47         ],[
  48                 AC_MSG_RESULT(no)
  49         ])
  50 ])
  51
  52 dnl #
  53 dnl # 4.8 API Change
  54 dnl #
  55 dnl # rwsem "->count" changed to atomic_long_t type
  56 dnl #
  57 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM_ATOMIC_LONG_COUNT], [
  58         ZFS_LINUX_TEST_SRC([rwsem_atomic_long_count], [
  59                 #include <linux/rwsem.h>
  60         ],[
  61                 DECLARE_RWSEM(dummy_semaphore);
  62                 (void) atomic_long_read(&dummy_semaphore.count);
  63         ])
  64 ])
  65
  66 AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ATOMIC_LONG_COUNT], [
  67         AC_MSG_CHECKING(
  68             [whether struct rw_semaphore has atomic_long_t member count])
  69         ZFS_LINUX_TEST_RESULT([rwsem_atomic_long_count], [
  70                 AC_MSG_RESULT(yes)
  71                 AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1,
  72                     [struct rw_semaphore has atomic_long_t member count])
  73         ],[
  74                 AC_MSG_RESULT(no)
  75         ])
  76 ])
  77
  78 AC_DEFUN([ZFS_AC_KERNEL_SRC_RWSEM], [
  79         ZFS_AC_KERNEL_SRC_RWSEM_SPINLOCK_IS_RAW
  80         ZFS_AC_KERNEL_SRC_RWSEM_ACTIVITY
  81         ZFS_AC_KERNEL_SRC_RWSEM_ATOMIC_LONG_COUNT
  82 ])
  83
  84 AC_DEFUN([ZFS_AC_KERNEL_RWSEM], [
  85         ZFS_AC_KERNEL_RWSEM_SPINLOCK_IS_RAW
  86         ZFS_AC_KERNEL_RWSEM_ACTIVITY
  87         ZFS_AC_KERNEL_RWSEM_ATOMIC_LONG_COUNT
  88 ])