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becc717f BA |
1 | dnl # |
2 | dnl # ZERO_PAGE() is an alias for emtpy_zero_page. On certain architectures | |
3 | dnl # this is a GPL exported variable. | |
4 | dnl # | |
5 | ||
6 | dnl # | |
7 | dnl # Checking if ZERO_PAGE is exported GPL-only | |
8 | dnl # | |
9 | AC_DEFUN([ZFS_AC_KERNEL_SRC_ZERO_PAGE], [ | |
10 | ZFS_LINUX_TEST_SRC([zero_page], [ | |
11 | #include <asm/pgtable.h> | |
12 | ], [ | |
13 | struct page *p __attribute__ ((unused)); | |
14 | p = ZERO_PAGE(0); | |
15 | ], [], [ZFS_META_LICENSE]) | |
16 | ]) | |
17 | ||
18 | AC_DEFUN([ZFS_AC_KERNEL_ZERO_PAGE], [ | |
19 | AC_MSG_CHECKING([whether ZERO_PAGE() is GPL-only]) | |
20 | ZFS_LINUX_TEST_RESULT([zero_page_license], [ | |
21 | AC_MSG_RESULT(no) | |
22 | ], [ | |
23 | AC_MSG_RESULT(yes) | |
24 | AC_DEFINE(HAVE_ZERO_PAGE_GPL_ONLY, 1, | |
25 | [ZERO_PAGE() is GPL-only]) | |
26 | ]) | |
27 | ]) |