Branch HEAD

[fs/lustre-release.git] / lustre / autoconf / lustre-core.m4

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index 772ba1f..7a628c0 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -598,6 +598,21 @@ AC_DEFUN([LC_EXPORT___IGET],
 ])
 ])
 
+#
+# LC_EXPORT_NR_FREE_BUFFER_PAGES
+# starting from 2.6.23 linux kernel exports nr_free_buffer_pages()
+#
+AC_DEFUN([LC_EXPORT_NR_FREE_BUFFER_PAGES],
+[LB_CHECK_SYMBOL_EXPORT([nr_free_buffer_pages],
+[mm/page_alloc.c],[
+        AC_DEFINE(HAVE_EXPORT_NR_FREE_BUFFER_PAGES, 1, [kernel exports nr_free_buffer_pages])
+],[
+       if test x$enable_server = xyes ; then
+               AC_MSG_ERROR([lustre server needs this symbol to be exported.])
+       fi
+])
+])
+
 
 AC_DEFUN([LC_LUSTRE_VERSION_H],
 [LB_CHECK_FILE([$LINUX/include/linux/lustre_version.h],[
@@ -1542,6 +1557,7 @@ AC_DEFUN([LC_PROG_LINUX],
          LC_UNREGISTER_BLKDEV_RETURN_INT
          LC_KERNEL_SPLICE_READ
          LC_HAVE_EXPORTFS_H
+         LC_EXPORT_NR_FREE_BUFFER_PAGES
 ])
 
 #