config/kernel-register_sysctl_table.m4

   1 dnl #
   2 dnl # Linux 6.5 removes register_sysctl_table
   3 dnl #
   4 AC_DEFUN([ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE], [
   5         ZFS_LINUX_TEST_SRC([has_register_sysctl_table], [
   6                 #include <linux/sysctl.h>
   7
   8                 static struct ctl_table dummy_table[] = {
   9                         {}
  10                 };
  11
  12     ],[
  13                 struct ctl_table_header *h
  14                         __attribute((unused)) = register_sysctl_table(dummy_table);
  15     ])
  16 ])
  17
  18 AC_DEFUN([ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE], [
  19         AC_MSG_CHECKING([whether register_sysctl_table exists])
  20         ZFS_LINUX_TEST_RESULT([has_register_sysctl_table], [
  21                 AC_MSG_RESULT([yes])
  22                 AC_DEFINE(HAVE_REGISTER_SYSCTL_TABLE, 1,
  23                         [register_sysctl_table exists])
  24         ],[
  25                 AC_MSG_RESULT([no])
  26         ])
  27 ])
  28
  29 dnl #
  30 dnl # Linux 6.11 register_sysctl() enforces that sysctl tables no longer
  31 dnl # supply a sentinel end-of-table element. 6.6 introduces
  32 dnl # register_sysctl_sz() to enable callers to choose, so we use it if
  33 dnl # available for backward compatibility.
  34 dnl #
  35 AC_DEFUN([ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_SZ], [
  36         ZFS_LINUX_TEST_SRC([has_register_sysctl_sz], [
  37                 #include <linux/sysctl.h>
  38         ],[
  39                 struct ctl_table test_table[] __attribute__((unused)) = {{}};
  40                 register_sysctl_sz("", test_table, 0);
  41         ])
  42 ])
  43
  44 AC_DEFUN([ZFS_AC_KERNEL_REGISTER_SYSCTL_SZ], [
  45         AC_MSG_CHECKING([whether register_sysctl_sz exists])
  46         ZFS_LINUX_TEST_RESULT([has_register_sysctl_sz], [
  47                 AC_MSG_RESULT([yes])
  48                 AC_DEFINE(HAVE_REGISTER_SYSCTL_SZ, 1,
  49                         [register_sysctl_sz exists])
  50         ],[
  51                 AC_MSG_RESULT([no])
  52         ])
  53 ])
  54
  55 dnl #
  56 dnl # Linux 6.11 makes const the ctl_table arg of proc_handler
  57 dnl #
  58 AC_DEFUN([ZFS_AC_KERNEL_SRC_PROC_HANDLER_CTL_TABLE_CONST], [
  59         ZFS_LINUX_TEST_SRC([has_proc_handler_ctl_table_const], [
  60                 #include <linux/sysctl.h>
  61
  62                 static int test_handler(
  63                     const struct ctl_table *ctl __attribute((unused)),
  64                     int write __attribute((unused)),
  65                     void *buffer __attribute((unused)),
  66                     size_t *lenp __attribute((unused)),
  67                     loff_t *ppos __attribute((unused)))
  68                 {
  69                         return (0);
  70                 }
  71         ], [
  72                 proc_handler *ph __attribute((unused)) =
  73                     &test_handler;
  74         ])
  75 ])
  76
  77 AC_DEFUN([ZFS_AC_KERNEL_PROC_HANDLER_CTL_TABLE_CONST], [
  78         AC_MSG_CHECKING([whether proc_handler ctl_table arg is const])
  79         ZFS_LINUX_TEST_RESULT([has_proc_handler_ctl_table_const], [
  80                 AC_MSG_RESULT([yes])
  81                 AC_DEFINE(HAVE_PROC_HANDLER_CTL_TABLE_CONST, 1,
  82                     [proc_handler ctl_table arg is const])
  83         ], [
  84                 AC_MSG_RESULT([no])
  85         ])
  86 ])