granicus.if.org Git - zfs/blob - 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_RWSEM_SPINLOCK_IS_RAW], [
   8         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
   9         tmp_flags="$EXTRA_KCFLAGS"
  10         EXTRA_KCFLAGS="-Werror"
  11         ZFS_LINUX_TRY_COMPILE([
  12                 #include <linux/rwsem.h>
  13         ],[
  14                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
  15                 raw_spinlock_t dummy_lock __attribute__ ((unused)) =
  16                     __RAW_SPIN_LOCK_INITIALIZER(dummy_lock);
  17                 dummy_semaphore.wait_lock = dummy_lock;
  18         ],[
  19                 AC_MSG_RESULT(yes)
  20                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
  21                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
  22         ],[
  23                 AC_MSG_RESULT(no)
  24         ])
  25         EXTRA_KCFLAGS="$tmp_flags"
  26 ])
  27
  28 dnl #
  29 dnl # 3.16 API Change
  30 dnl #
  31 dnl # rwsem-spinlock "->activity" changed to "->count"
  32 dnl #
  33 AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ACTIVITY], [
  34         AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
  35         tmp_flags="$EXTRA_KCFLAGS"
  36         EXTRA_KCFLAGS="-Werror"
  37         ZFS_LINUX_TRY_COMPILE([
  38                 #include <linux/rwsem.h>
  39         ],[
  40                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
  41                 dummy_semaphore.activity = 0;
  42         ],[
  43                 AC_MSG_RESULT(yes)
  44                 AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1,
  45                 [struct rw_semaphore has member activity])
  46         ],[
  47                 AC_MSG_RESULT(no)
  48         ])
  49         EXTRA_KCFLAGS="$tmp_flags"
  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_RWSEM_ATOMIC_LONG_COUNT], [
  58         AC_MSG_CHECKING(
  59         [whether struct rw_semaphore has atomic_long_t member count])
  60         tmp_flags="$EXTRA_KCFLAGS"
  61         EXTRA_KCFLAGS="-Werror"
  62         ZFS_LINUX_TRY_COMPILE([
  63                 #include <linux/rwsem.h>
  64         ],[
  65                 DECLARE_RWSEM(dummy_semaphore);
  66                 (void) atomic_long_read(&dummy_semaphore.count);
  67         ],[
  68                 AC_MSG_RESULT(yes)
  69                 AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1,
  70                 [struct rw_semaphore has atomic_long_t member count])
  71         ],[
  72                 AC_MSG_RESULT(no)
  73         ])
  74         EXTRA_KCFLAGS="$tmp_flags"
  75 ])