diff options
Diffstat (limited to 'config')
| -rw-r--r-- | config/spl-build.m4 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index ce798cc74..750218941 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -803,6 +803,31 @@ AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [ ]) dnl # +dnl # 2.6.17 API change +dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and +dnl # next_zone() are introduced to simplify for_each_zone(). These symbols +dnl # were exported in 2.6.17 for use by modules which was consistent with +dnl # the previous implementation of for_each_zone(). From 2.6.18 - 2.6.19 +dnl # the symbols were exported as 'unused', and by 2.6.20 they exports +dnl # were dropped entirely leaving modules no way to directly iterate over +dnl # the zone list. Because we need access to the zone helpers we check +dnl # if the kernel contains the old or new implementation. Then we check +dnl # to see if the symbols we need for each version are available. If they +dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name(). +dnl # +AC_DEFUN([SPL_AC_PGDAT_HELPERS], [ + AC_MSG_CHECKING([whether symbol *_pgdat exist]) + grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null + rc=$? + if test $rc -eq 0; then + AC_MSG_RESULT([yes]) + AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available]) + else + AC_MSG_RESULT([no]) + fi +]) + +dnl # dnl # Proposed API change, dnl # This symbol is not available in stock kernels. You may build a dnl # custom kernel with the *-spl-export-symbols.patch which will export @@ -851,6 +876,19 @@ AC_DEFUN([SPL_AC_NEXT_ZONE], [ ]) dnl # +dnl # 2.6.17 API change, +dnl # See SPL_AC_PGDAT_HELPERS for details. +dnl # +AC_DEFUN([SPL_AC_PGDAT_LIST], [ + SPL_CHECK_SYMBOL_EXPORT( + [pgdat_list], + [], + [AC_DEFINE(HAVE_PGDAT_LIST, 1, + [pgdat_list is available])], + []) +]) + +dnl # dnl # Proposed API change, dnl # This symbol is not available in stock kernels. You may build a dnl # custom kernel with the *-spl-export-symbols.patch which will export |