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Date: Sun, 20 Nov 2016 20:59:43 +0200
From: Netanel Belgazal <netanel@...apurnalabs.com>
To: kbuild test robot <lkp@...el.com>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org,
davem@...emloft.net, netdev@...r.kernel.org, dwmw@...zon.com,
zorik@...apurnalabs.com, alex@...apurnalabs.com,
saeed@...apurnalabs.com, msw@...zon.com, aliguori@...zon.com,
nafea@...apurnalabs.com
Subject: Re: [PATCH net 07/18] net/ena: refactor ena_get_stats64 to be atomic
context safe
This warning isn't a real issue since adapter->num_queues can't be zero.
Anyway, I'll use the adapter's syncp in V2 to avoid this warning.
On 11/20/2016 12:09 PM, kbuild test robot wrote:
> 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 <aryabinin@...tuozzo.com>
> :::::: CC: Ingo Molnar <mingo@...nel.org>
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
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