config/kernel-sysfs.m4

   1 dnl #
   2 dnl # Linux 5.2/5.18 API
   3 dnl #
   4 dnl # In cdb4f26a63c391317e335e6e683a614358e70aeb ("kobject: kobj_type: remove default_attrs")
   5 dnl #   struct kobj_type.default_attrs
   6 dnl # was finally removed in favour of
   7 dnl #   struct kobj_type.default_groups
   8 dnl #
   9 dnl # This was added in aa30f47cf666111f6bbfd15f290a27e8a7b9d854 ("kobject: Add support for default attribute groups to kobj_type"),
  10 dnl # if both are present (5.2-5.17), we prefer default_groups; they're otherwise equivalent
  11 dnl #
  12 AC_DEFUN([ZFS_AC_KERNEL_SRC_SYSFS_DEFAULT_GROUPS], [
  13         ZFS_LINUX_TEST_SRC([sysfs_default_groups], [
  14                 #include <linux/kobject.h>
  15         ],[
  16                 struct kobj_type __attribute__ ((unused)) kt = {
  17                         .default_groups = (const struct attribute_group **)NULL };
  18         ])
  19 ])
  20
  21 AC_DEFUN([ZFS_AC_KERNEL_SYSFS_DEFAULT_GROUPS], [
  22         AC_MSG_CHECKING([whether struct kobj_type.default_groups exists])
  23         ZFS_LINUX_TEST_RESULT([sysfs_default_groups],[
  24                 AC_MSG_RESULT(yes)
  25                 AC_DEFINE([HAVE_SYSFS_DEFAULT_GROUPS], 1, [struct kobj_type has default_groups])
  26         ],[
  27                 AC_MSG_RESULT(no)
  28         ])
  29 ])
  30
  31 AC_DEFUN([ZFS_AC_KERNEL_SRC_SYSFS], [
  32         ZFS_AC_KERNEL_SRC_SYSFS_DEFAULT_GROUPS
  33 ])
  34
  35 AC_DEFUN([ZFS_AC_KERNEL_SYSFS], [
  36         ZFS_AC_KERNEL_SYSFS_DEFAULT_GROUPS
  37 ])