ipset: Support kernels with at least system_wq support

diff --git a/configure.ac b/configure.ac
index b7b69d19a5a2560de58e93b2618271c67eec37b1..a03401b96c5fe6c2c28fa30c2d16787144281510 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -212,9 +212,12 @@ if test -f $ksourcedir/include/linux/workqueue.h && \
    $GREP -q 'system_power_efficient_wq' $ksourcedir/include/linux/workqueue.h; then
        AC_MSG_RESULT(yes)
        AC_SUBST(HAVE_SYSTEM_POWER_EFFICIENT_WQ, define)
-else
+elif test -f $ksourcedir/include/linux/workqueue.h && \
+   $GREP -q 'system_wq' $ksourcedir/include/linux/workqueue.h; then
        AC_MSG_RESULT(no)
        AC_SUBST(HAVE_SYSTEM_POWER_EFFICIENT_WQ, undef)
+else
+       AC_MSG_ERROR([Kernel source tree is too old, at least v2.36 is required])
 fi
 
 AC_MSG_CHECKING([kernel source for struct xt_action_param])