Add configure check for user_path_dir()

I didn't notice at the time but user_path_dir() was not introduced
at the same time as set_fs_pwd() change.  I had lumped the two
together but in fact user_path_dir() was introduced in 2.6.27 and
set_fs_pwd() taking 2 args was introduced in 2.6.25.  This means
builds against 2.6.25-2.6.26 kernels were broken.

To fix this I've added a check for user_path_dir() and no longer
assume that if set_fs_pwd() takes 2 args then user_path_dir() is
also available.

1 files changed, 82 insertions, 0 deletions

diff --git a/configure b/configure
index a7ff89e26..4c5df996f 100755
--- a/configure
+++ b/configure
@@ -14459,6 +14459,47 @@ fi
 
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether symbol user_path_at is exported" >&5
+$as_echo_n "checking whether symbol user_path_at is exported... " >&6; }
+	grep -q -E '[[:space:]]user_path_at[[:space:]]' \
+		$LINUX_OBJ/Module*.symvers 2>/dev/null
+	rc=$?
+	if test $rc -ne 0; then
+		export=0
+		for file in ; do
+			grep -q -E "EXPORT_SYMBOL.*(user_path_at)" \
+				"$LINUX_OBJ/$file" 2>/dev/null
+			rc=$?
+		        if test $rc -eq 0; then
+		                export=1
+		                break;
+		        fi
+		done
+		if test $export -eq 0; then
+			{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+		else
+			{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USER_PATH_DIR 1
+_ACEOF
+
+		fi
+	else
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USER_PATH_DIR 1
+_ACEOF
+
+	fi
+
+
+
 	{ $as_echo "$as_me:$LINENO: checking whether symbol set_fs_pwd is exported" >&5
 $as_echo_n "checking whether symbol set_fs_pwd is exported... " >&6; }
 	grep -q -E '[[:space:]]set_fs_pwd[[:space:]]' \
@@ -17931,6 +17972,47 @@ fi
 
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether symbol user_path_at is exported" >&5
+$as_echo_n "checking whether symbol user_path_at is exported... " >&6; }
+	grep -q -E '[[:space:]]user_path_at[[:space:]]' \
+		$LINUX_OBJ/Module*.symvers 2>/dev/null
+	rc=$?
+	if test $rc -ne 0; then
+		export=0
+		for file in ; do
+			grep -q -E "EXPORT_SYMBOL.*(user_path_at)" \
+				"$LINUX_OBJ/$file" 2>/dev/null
+			rc=$?
+		        if test $rc -eq 0; then
+		                export=1
+		                break;
+		        fi
+		done
+		if test $export -eq 0; then
+			{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+		else
+			{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USER_PATH_DIR 1
+_ACEOF
+
+		fi
+	else
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USER_PATH_DIR 1
+_ACEOF
+
+	fi
+
+
+
 	{ $as_echo "$as_me:$LINENO: checking whether symbol set_fs_pwd is exported" >&5
 $as_echo_n "checking whether symbol set_fs_pwd is exported... " >&6; }
 	grep -q -E '[[:space:]]set_fs_pwd[[:space:]]' \