config/kernel-acl-refcount.m4

   1 dnl #
   2 dnl # 4.16 kernel: check if struct posix_acl acl.a_refcount is a refcount_t.
   3 dnl # It's an atomic_t on older kernels.
   4 dnl #
   5 AC_DEFUN([ZFS_AC_KERNEL_ACL_HAS_REFCOUNT], [
   6         AC_MSG_CHECKING([whether posix_acl has refcount_t])
   7         ZFS_LINUX_TRY_COMPILE([
   8                 #include <linux/backing-dev.h>
   9                 #include <linux/refcount.h>
  10                 #include <linux/posix_acl.h>
  11         ],[
  12                 struct posix_acl acl;
  13                 refcount_t *r __attribute__ ((unused)) = &acl.a_refcount;
  14         ],[
  15                 AC_MSG_RESULT(yes)
  16                 AC_DEFINE(HAVE_ACL_REFCOUNT, 1, [posix_acl has refcount_t])
  17         ],[
  18                 AC_MSG_RESULT(no)
  19         ])
  20 ])