+# LC_EXPORT_GENERIC_ERROR_REMOVE_PAGE
+#
+AC_DEFUN([LC_EXPORT_GENERIC_ERROR_REMOVE_PAGE],
+ [LB_CHECK_SYMBOL_EXPORT(
+ [generic_error_remove_page],
+ [mm/truncate.c],
+ [AC_DEFINE(HAS_GENERIC_ERROR_REMOVE_PAGE, 1,
+ [kernel export generic_error_remove_page])],
+ [])
+ ]
+)
+
+# 2.6.32 if kernel export access_process_vm().
+AC_DEFUN([LC_EXPORT_ACCESS_PROCESS_VM],
+ [LB_CHECK_SYMBOL_EXPORT([access_process_vm],
+ [mm/memory.c],
+ [AC_DEFINE(HAVE_ACCESS_PROCESS_VM, 1,
+ [access_process_vm function is present])],
+ [])
+ ]
+)
+
+#
+# 2.6.36 fs_struct.lock use spinlock instead of rwlock.
+#
+AC_DEFUN([LC_FS_STRUCT_RWLOCK],
+[AC_MSG_CHECKING([if fs_struct.lock use rwlock])
+LB_LINUX_TRY_COMPILE([
+ #include <asm/atomic.h>
+ #include <linux/spinlock.h>
+ #include <linux/fs_struct.h>
+],[
+ ((struct fs_struct *)0)->lock = (rwlock_t){ 0 };
+],[
+ AC_DEFINE(HAVE_FS_STRUCT_RWLOCK, 1,
+ [fs_struct.lock use rwlock])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.36 super_operations add evict_inode method. it hybird of
+# delete_inode & clear_inode.
+#
+AC_DEFUN([LC_SBOPS_EVICT_INODE],
+[AC_MSG_CHECKING([if super_operations.evict_inode exist])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ ((struct super_operations *)0)->evict_inode(NULL);
+],[
+ AC_DEFINE(HAVE_SBOPS_EVICT_INODE, 1,
+ [super_operations.evict_inode() is exist in kernel])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.35 file_operations.fsync taken 2 arguments.
+# 3.0.0 file_operations.fsync takes 4 arguments.
+#
+AC_DEFUN([LC_FILE_FSYNC],
+[AC_MSG_CHECKING([if file_operations.fsync takes 4 or 2 arguments])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+],[
+ ((struct file_operations *)0)->fsync(NULL, 0, 0, 0);
+],[
+ AC_DEFINE(HAVE_FILE_FSYNC_4ARGS, 1,
+ [file_operations.fsync takes 4 arguments])
+ AC_MSG_RESULT([yes, 4 args])
+],[
+ LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ ],[
+ ((struct file_operations *)0)->fsync(NULL, 0);
+ ],[
+ AC_DEFINE(HAVE_FILE_FSYNC_2ARGS, 1,
+ [file_operations.fsync takes 2 arguments])
+ AC_MSG_RESULT([yes, 2 args])
+ ],[
+ AC_MSG_RESULT([no])
+ ])
+])
+])
+
+#
+# 2.6.37 remove kernel_locked
+#
+AC_DEFUN([LC_KERNEL_LOCKED],
+[AC_MSG_CHECKING([if kernel_locked is defined])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/smp_lock.h>
+],[
+ kernel_locked();
+],[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE(HAVE_KERNEL_LOCKED, 1,
+ [kernel_locked is defined])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.38 dentry_operations.d_compare() taken 7 arguments.
+#
+AC_DEFUN([LC_D_COMPARE_7ARGS],
+[AC_MSG_CHECKING([if d_compare taken 7 arguments])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/dcache.h>
+],[
+ ((struct dentry_operations*)0)->d_compare(NULL,NULL,NULL,NULL,0,NULL,NULL);
+],[
+ AC_DEFINE(HAVE_D_COMPARE_7ARGS, 1,
+ [d_compare need 7 arguments])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.38 dentry_operations.d_delete() defined 'const' for 1st parameter.
+#
+AC_DEFUN([LC_D_DELETE_CONST],
+[AC_MSG_CHECKING([if d_delete has const declare on first parameter])
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_LINUX_TRY_COMPILE([
+ #include <linux/dcache.h>
+],[
+ const struct dentry *d = NULL;
+ ((struct dentry_operations*)0)->d_delete(d);
+],[
+ AC_DEFINE(HAVE_D_DELETE_CONST, const,
+ [d_delete first parameter declared const])
+ AC_MSG_RESULT([yes])
+],[
+ AC_DEFINE(HAVE_D_DELETE_CONST, , [])
+ AC_MSG_RESULT([no])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+])
+
+#
+# 2.6.38 dcache_lock removed. rcu-walk commited.
+#
+AC_DEFUN([LC_DCACHE_LOCK],
+[AC_MSG_CHECKING([if dcache_lock is exist])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/dcache.h>
+],[
+ spin_lock(&dcache_lock);
+],[
+ AC_DEFINE(HAVE_DCACHE_LOCK, 1,
+ [dcache_lock is exist])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#