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dnl #
dnl # Starting from Linux 5.13, flush_dcache_page() becomes an inline
dnl # function and may indirectly referencing GPL-only symbols:
dnl # on powerpc: cpu_feature_keys
dnl # on riscv: PageHuge (added from 6.2)
dnl #
dnl #
dnl # Checking if flush_dcache_page is exported GPL-only
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE], [
ZFS_LINUX_TEST_SRC([flush_dcache_page], [
#include <asm/cacheflush.h>
], [
flush_dcache_page(0);
], [], [ZFS_META_LICENSE])
])
AC_DEFUN([ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE], [
AC_MSG_CHECKING([whether flush_dcache_page() is GPL-only])
ZFS_LINUX_TEST_RESULT([flush_dcache_page_license], [
AC_MSG_RESULT(no)
], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FLUSH_DCACHE_PAGE_GPL_ONLY, 1,
[flush_dcache_page() is GPL-only])
])
])
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