LU-812 synchronize_rcu no longer a define

synchronize_kernel() in old kernel(pre 2.6.12) is no longer supported
and synchronize_rcu is no longer a define after 2.6.33. Remove the no
longer used old code.

Change-Id: Iac668efc35d82e6218b1924eca009f92d19a0c7a
Signed-off-by: Wally Wang <wang@cray.com>
Reviewed-on: http://review.whamcloud.com/1952
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index 10fea4d..b069946 100644 (file)
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -850,17 +850,6 @@ LB_LINUX_TRY_COMPILE([
 EXTRA_KCFLAGS="$tmp_flags"
 ])
 
-# 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])
-],[
-])
-])
-
 # 2.6.15
 
 # LC_INODE_I_MUTEX

diff --git a/lustre/include/linux/lustre_compat25.h b/lustre/include/linux/lustre_compat25.h
index 0ecd59f..470b2b7 100644 (file)
--- a/lustre/include/linux/lustre_compat25.h
+++ b/lustre/include/linux/lustre_compat25.h
@@ -684,13 +684,6 @@ static inline int ll_crypto_hmac(struct crypto_tfm *tfm,
 #define ll_crypto_tfm_alg_max_keysize  crypto_tfm_alg_max_keysize
 #endif /* HAVE_ASYNC_BLOCK_CIPHER */
 
-#ifndef HAVE_SYNCHRONIZE_RCU
-/* Linux 2.6.32 provides define when !CONFIG_TREE_PREEMPT_RCU */
-#ifndef synchronize_rcu
-#define synchronize_rcu() synchronize_kernel()
-#endif
-#endif
-
 #ifdef HAVE_FILE_REMOVE_SUID
 # define ll_remove_suid(file, mnt)       file_remove_suid(file)
 #else