Hello, The build error occurs by compat-wireless-2011-11-10. My kernel is 2.6.27. CC [M] /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-calib.o /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-calib.c: In function 'iwlagn_gain_computation': /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-calib.c:891: warning: comparison of distinct pointer types lacks a cast CC [M] /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-io.o CC [M] /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-tt.o CC [M] /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-sta.o CC [M] /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.o /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.c: In function 'iwlagn_rx_noa_notification': /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.c:1075: error: implicit declaration of function 'kfree_rcu' /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.c:1075: error: 'rcu_head' undeclared (first use in this function) /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.c:1075: error: (Each undeclared identifier is reported only once /home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.c:1075: error: for each function it appears in.) make[4]: *** [/home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi/iwl-agn-rx.o] Error 1 make[3]: *** [/home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless/iwlwifi] Error 2 make[2]: *** [/home/miyabi/test/compat-wireless/compat-wireless-2011-11-15/drivers/net/wireless] Error 2 make[1]: *** [_module_/home/miyabi/test/compat-wireless/compat-wireless-2011-11-15] Error 2 make[1]: Leaving directory `/usr/src/kernels/2.6.27-74vl5-x86_64' make: *** [modules] Error 2 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html