Hi Netanel, [auto build test WARNING on net/master]
url: https://github.com/0day-ci/linux/commits/Netanel-Belgazal/Update-ENA-driver-to-version-1-1-2/20161120-165649 config: i386-randconfig-x009-201647 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_napi_enable_all Cyclomatic Complexity 1 include/linux/dma-mapping.h:dma_map_single_attrs Cyclomatic Complexity 1 include/linux/dynamic_queue_limits.h:dql_queued Cyclomatic Complexity 3 include/linux/netdevice.h:netdev_tx_sent_queue Cyclomatic Complexity 1 include/linux/netdevice.h:dev_kfree_skb_any Cyclomatic Complexity 1 include/linux/netdevice.h:netdev_tx_reset_queue Cyclomatic Complexity 6 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_free_tx_bufs Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_free_all_tx_bufs Cyclomatic Complexity 3 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_free_rx_page Cyclomatic Complexity 3 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_free_rx_bufs Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_free_all_rx_bufs Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_down Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_close Cyclomatic Complexity 3 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_update_on_link_change Cyclomatic Complexity 2 include/linux/netdevice.h:napi_schedule_irqoff Cyclomatic Complexity 1 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_intr_msix_io Cyclomatic Complexity 4 include/linux/cpumask.h:cpumask_check Cyclomatic Complexity 1 include/linux/cpumask.h:cpumask_set_cpu Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_setup_io_intr Cyclomatic Complexity 1 include/linux/interrupt.h:request_irq Cyclomatic Complexity 9 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_request_io_irq Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_request_mgmnt_irq Cyclomatic Complexity 8 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_setup_tx_resources Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_setup_all_tx_resources Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_setup_rx_resources Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_setup_all_rx_resources Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_create_io_tx_queue Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_create_all_io_tx_queues Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_create_io_rx_queue Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_create_all_io_rx_queues Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_init_napi Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_eth_com.h:ena_com_update_dev_comp_head Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_eth_com.h:ena_com_write_sq_doorbell Cyclomatic Complexity 4 include/linux/netdevice.h:netdev_tx_completed_queue Cyclomatic Complexity 14 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_clean_tx_irq Cyclomatic Complexity 2 include/linux/netdevice.h:netif_tx_unlock Cyclomatic Complexity 1 include/linux/skbuff.h:__netdev_alloc_skb_ip_align Cyclomatic Complexity 1 include/linux/skbuff.h:netdev_alloc_skb_ip_align Cyclomatic Complexity 16 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_rx_skb Cyclomatic Complexity 1 include/linux/gfp.h:__alloc_pages Cyclomatic Complexity 1 include/linux/gfp.h:__alloc_pages_node Cyclomatic Complexity 2 include/linux/gfp.h:alloc_pages_node Cyclomatic Complexity 6 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_alloc_rx_page Cyclomatic Complexity 8 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_refill_rx_bufs Cyclomatic Complexity 11 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_clean_rx_irq Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_refill_all_rx_bufs Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_update_ring_numa_node Cyclomatic Complexity 8 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_change_mtu Cyclomatic Complexity 2 include/linux/netdevice.h:napi_schedule Cyclomatic Complexity 1 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_device_io_resume Cyclomatic Complexity 1 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_device_io_suspend Cyclomatic Complexity 2 include/linux/seqlock.h:seqcount_lockdep_reader_access Cyclomatic Complexity 1 include/linux/seqlock.h:read_seqcount_begin Cyclomatic Complexity 1 include/linux/u64_stats_sync.h:__u64_stats_fetch_begin Cyclomatic Complexity 1 include/linux/u64_stats_sync.h:u64_stats_fetch_begin_irq Cyclomatic Complexity 6 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_get_stats64 Cyclomatic Complexity 6 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_notification Cyclomatic Complexity 2 include/linux/skbuff.h:__skb_linearize Cyclomatic Complexity 2 include/linux/skbuff.h:skb_linearize Cyclomatic Complexity 5 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_check_and_linearize_skb Cyclomatic Complexity 3 include/linux/skbuff.h:sw_tx_timestamp Cyclomatic Complexity 1 include/linux/skbuff.h:skb_tx_timestamp Cyclomatic Complexity 22 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_start_xmit Cyclomatic Complexity 1 arch/x86/include/asm/io.h:ioremap Cyclomatic Complexity 4 include/linux/dma-mapping.h:dma_set_mask Cyclomatic Complexity 1 include/linux/pci-dma-compat.h:pci_set_dma_mask Cyclomatic Complexity 2 include/linux/dma-mapping.h:dma_set_coherent_mask Cyclomatic Complexity 1 include/linux/pci-dma-compat.h:pci_set_consistent_dma_mask Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_config_host_info Cyclomatic Complexity 12 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_device_init Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_calc_io_queue_num Cyclomatic Complexity 69 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_calc_queue_size Cyclomatic Complexity 1 include/linux/etherdevice.h:eth_random_addr Cyclomatic Complexity 1 include/linux/etherdevice.h:eth_hw_addr_random Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_set_conf_feat_params Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_init_io_rings Cyclomatic Complexity 1 include/linux/cpu_rmap.h:alloc_irq_cpu_rmap Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_init_rx_cpu_rmap Cyclomatic Complexity 14 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_enable_msix Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_intr_msix_mgmnt Cyclomatic Complexity 1 include/linux/cpumask.h:cpumask_first Cyclomatic Complexity 1 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_setup_mgmnt_intr Cyclomatic Complexity 3 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_enable_msix_and_set_admin_interrupts Cyclomatic Complexity 6 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_rss_init_default Cyclomatic Complexity 7 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_rss_configure Cyclomatic Complexity 3 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_up_complete Cyclomatic Complexity 9 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_up Cyclomatic Complexity 7 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_fw_reset_device Cyclomatic Complexity 6 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_open Cyclomatic Complexity 8 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_config_debug_area Cyclomatic Complexity 21 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_probe Cyclomatic Complexity 2 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_init Cyclomatic Complexity 1 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_adjust_intr_moderation Cyclomatic Complexity 4 drivers/net/ethernet/amazon/ena/ena_netdev.c:ena_io_poll In file included from include/linux/linkage.h:4:0, from include/linux/kernel.h:6, from include/linux/cpumask.h:9, from include/linux/cpu_rmap.h:13, from drivers/net/ethernet/amazon/ena/ena_netdev.c:36: drivers/net/ethernet/amazon/ena/ena_netdev.c: In function 'ena_get_stats64': >> include/linux/compiler.h:231:26: warning: 'rx_ring' may be used >> uninitialized in this function [-Wmaybe-uninitialized] case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \ ^ drivers/net/ethernet/amazon/ena/ena_netdev.c:2188:19: note: 'rx_ring' was declared here struct ena_ring *rx_ring, *tx_ring; ^~~~~~~ vim +/rx_ring +231 include/linux/compiler.h fe8c8a12 Cesar Eduardo Barros 2013-11-25 215 #ifndef OPTIMIZER_HIDE_VAR fe8c8a12 Cesar Eduardo Barros 2013-11-25 216 #define OPTIMIZER_HIDE_VAR(var) barrier() fe8c8a12 Cesar Eduardo Barros 2013-11-25 217 #endif fe8c8a12 Cesar Eduardo Barros 2013-11-25 218 6f33d587 Rusty Russell 2012-11-22 219 /* Not-quite-unique ID. */ 6f33d587 Rusty Russell 2012-11-22 220 #ifndef __UNIQUE_ID 6f33d587 Rusty Russell 2012-11-22 221 # define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__) 6f33d587 Rusty Russell 2012-11-22 222 #endif 6f33d587 Rusty Russell 2012-11-22 223 230fa253 Christian Borntraeger 2014-11-25 224 #include <uapi/linux/types.h> 230fa253 Christian Borntraeger 2014-11-25 225 d976441f Andrey Ryabinin 2015-10-19 226 #define __READ_ONCE_SIZE \ d976441f Andrey Ryabinin 2015-10-19 227 ({ \ d976441f Andrey Ryabinin 2015-10-19 228 switch (size) { \ d976441f Andrey Ryabinin 2015-10-19 229 case 1: *(__u8 *)res = *(volatile __u8 *)p; break; \ d976441f Andrey Ryabinin 2015-10-19 230 case 2: *(__u16 *)res = *(volatile __u16 *)p; break; \ d976441f Andrey Ryabinin 2015-10-19 @231 case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \ d976441f Andrey Ryabinin 2015-10-19 232 case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \ d976441f Andrey Ryabinin 2015-10-19 233 default: \ d976441f Andrey Ryabinin 2015-10-19 234 barrier(); \ d976441f Andrey Ryabinin 2015-10-19 235 __builtin_memcpy((void *)res, (const void *)p, size); \ d976441f Andrey Ryabinin 2015-10-19 236 barrier(); \ d976441f Andrey Ryabinin 2015-10-19 237 } \ d976441f Andrey Ryabinin 2015-10-19 238 }) d976441f Andrey Ryabinin 2015-10-19 239 :::::: The code at line 231 was first introduced by commit :::::: d976441f44bc5d48635d081d277aa76556ffbf8b compiler, atomics, kasan: Provide READ_ONCE_NOCHECK() :::::: TO: Andrey Ryabinin <aryabi...@virtuozzo.com> :::::: CC: Ingo Molnar <mi...@kernel.org> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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