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dnl #
dnl # ZERO_PAGE() is an alias for emtpy_zero_page. On certain architectures
dnl # this is a GPL exported variable.
dnl #
dnl #
dnl # Checking if ZERO_PAGE is exported GPL-only
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_ZERO_PAGE], [
ZFS_LINUX_TEST_SRC([zero_page], [
#include <asm/pgtable.h>
], [
struct page *p __attribute__ ((unused));
p = ZERO_PAGE(0);
], [], [ZFS_META_LICENSE])
])
AC_DEFUN([ZFS_AC_KERNEL_ZERO_PAGE], [
AC_MSG_CHECKING([whether ZERO_PAGE() is GPL-only])
ZFS_LINUX_TEST_RESULT([zero_page_license], [
AC_MSG_RESULT(no)
], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ZERO_PAGE_GPL_ONLY, 1,
[ZERO_PAGE() is GPL-only])
])
])
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