b=18015

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

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index cbf9877..7af19f5 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -809,6 +809,17 @@ LB_LINUX_TRY_COMPILE([
 ])
 ])
 
+# LC_EXPORT_SYNCHRONIZE_RCU
+# after 2.6.12 synchronize_rcu is preferred over synchronize_kernel
+AC_DEFUN([LC_EXPORT_SYNCHRONIZE_RCU],
+[LB_CHECK_SYMBOL_EXPORT([synchronize_rcu],
+[kernel/rcupdate.c],[
+        AC_DEFINE(HAVE_SYNCHRONIZE_RCU, 1,
+                [in 2.6.12 synchronize_rcu preferred over synchronize_kernel])
+],[
+])
+])
+
 # LC_INODE_I_MUTEX
 # after 2.6.15 inode have i_mutex intead of i_sem
 AC_DEFUN([LC_INODE_I_MUTEX],
@@ -1631,6 +1642,7 @@ AC_DEFUN([LC_PROG_LINUX],
 
          # 2.6.12
          LC_RW_TREE_LOCK
+         LC_EXPORT_SYNCHRONIZE_RCU
 
          # 2.6.15
          LC_INODE_I_MUTEX