config/kernel-flush_dcache_page.m4

   1 dnl #
   2 dnl # Starting from Linux 5.13, flush_dcache_page() becomes an inline
   3 dnl # function and may indirectly referencing GPL-only symbols:
   4 dnl # on powerpc: cpu_feature_keys
   5 dnl # on riscv: PageHuge (added from 6.2)
   6 dnl #
   7
   8 dnl #
   9 dnl # Checking if flush_dcache_page is exported GPL-only
  10 dnl #
  11 AC_DEFUN([ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE], [
  12         ZFS_LINUX_TEST_SRC([flush_dcache_page], [
  13                 #include <asm/cacheflush.h>
  14         ], [
  15                 flush_dcache_page(0);
  16         ], [], [ZFS_META_LICENSE])
  17 ])
  18 AC_DEFUN([ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE], [
  19         AC_MSG_CHECKING([whether flush_dcache_page() is GPL-only])
  20         ZFS_LINUX_TEST_RESULT([flush_dcache_page_license], [
  21                 AC_MSG_RESULT(no)
  22         ], [
  23                 AC_MSG_RESULT(yes)
  24                 AC_DEFINE(HAVE_FLUSH_DCACHE_PAGE_GPL_ONLY, 1,
  25                     [flush_dcache_page() is GPL-only])
  26         ])
  27 ])