kernel-rwsem.m4

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    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 ])

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/config/kernel-rwsem.m4

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sys/contrib/openzfs/config/kernel-rwsem.m4