zfs-builds-mm/zfs-0.8.1/config/kernel-totalhigh_pages.m4

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dnl #
dnl # 5.0 API change
dnl #
dnl # ca79b0c211af mm: convert totalram_pages and totalhigh_pages variables to atomic
dnl #
AC_DEFUN([ZFS_AC_KERNEL_TOTALHIGH_PAGES], [
AC_MSG_CHECKING([whether totalhigh_pages() exists])
ZFS_LINUX_TRY_COMPILE([
#include <linux/highmem.h>
],[
unsigned long pages __attribute__ ((unused));
pages = totalhigh_pages();
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_TOTALHIGH_PAGES, 1, [totalhigh_pages() exists])
],[
AC_MSG_RESULT(no)
])
])