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Date: Mon, 20 Nov 2023 12:41:12 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Coco Li <lixiaoyan@...gle.com>
Cc: kernel test robot <lkp@...el.com>, Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>,
Mubashir Adnan Qureshi <mubashirq@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
Jonathan Corbet <corbet@....net>, David Ahern <dsahern@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, llvm@...ts.linux.dev,
oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
Chao Wu <wwchao@...gle.com>, Wei Wang <weiwan@...gle.com>,
Pradeep Nemavat <pnemavat@...gle.com>
Subject: Re: [PATCH v7 net-next 4/5] net-device: reorganize net_device fast
path variables
On Fri, Nov 17, 2023 at 11:44:41AM -0800, Coco Li wrote:
> Spending some time setting up a clang17 compatible environment, will
> update soon.
In case you have not seen it, I have prebuilt LLVM toolchains available
on kernel.org that should make working in your current environment
easier:
https://mirrors.edge.kernel.org/pub/tools/llvm/
For example, I just tested with:
$ mkdir -p $HOME/toolchains
$ curl -LSs https://mirrors.edge.kernel.org/pub/tools/llvm/files/llvm-17.0.5-"$(uname -m)".tar.xz | tar -C $HOME/toolchains -xJf -
$ curl -LSso .config https://download.01.org/0day-ci/archive/20231116/202311162002.m26ObVLU-lkp@intel.com/config
$ make -skj"$(nproc)" ARCH=powerpc LLVM=$HOME/toolchains/llvm-17.0.5-"$(uname -m)"/bin/ olddefconfig net/core/dev.o
net/core/dev.c:11547:2: error: call to '__compiletime_assert_971' declared with 'error' attribute: BUILD_BUG_ON failed: offsetof(struct net_device, __cacheline_group_end__net_device_read_txrx) - offsetofend(struct net_device, __cacheline_group_begin__net_device_read_txrx) > 24
11547 | CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 24);
| ^
include/linux/cache.h:108:2: note: expanded from macro 'CACHELINE_ASSERT_GROUP_SIZE'
108 | BUILD_BUG_ON(offsetof(TYPE, __cacheline_group_end__##GROUP) - \
| ^
include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^
include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^
note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:423:2: note: expanded from macro '_compiletime_assert'
423 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:416:4: note: expanded from macro '__compiletime_assert'
416 | prefix ## suffix(); \
| ^
<scratch space>:11:1: note: expanded from here
11 | __compiletime_assert_971
| ^
1 error generated.
See the Kbuild documentation if you have any other questions (or just
ask me directly):
https://kernel.org/doc/html/latest/kbuild/llvm.html
Cheers,
Nathan
> On Thu, Nov 16, 2023 at 4:40 AM kernel test robot <lkp@...el.com> wrote:
> >
> > Hi Coco,
> >
> > kernel test robot noticed the following build errors:
> >
> > [auto build test ERROR on net-next/main]
> >
> > url: https://github.com/intel-lab-lkp/linux/commits/Coco-Li/Documentations-Analyze-heavily-used-Networking-related-structs/20231114-073648
> > base: net-next/main
> > patch link: https://lore.kernel.org/r/20231113233301.1020992-5-lixiaoyan%40google.com
> > patch subject: [PATCH v7 net-next 4/5] net-device: reorganize net_device fast path variables
> > config: powerpc-mpc8313_rdb_defconfig (https://download.01.org/0day-ci/archive/20231116/202311162002.m26ObVLU-lkp@intel.com/config)
> > compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231116/202311162002.m26ObVLU-lkp@intel.com/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@...el.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202311162002.m26ObVLU-lkp@intel.com/
> >
> > All errors (new ones prefixed by >>):
> >
> > net/core/dev.c:4079:1: warning: unused function 'sch_handle_ingress' [-Wunused-function]
> > 4079 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
> > | ^
> > net/core/dev.c:4086:1: warning: unused function 'sch_handle_egress' [-Wunused-function]
> > 4086 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
> > | ^
> > net/core/dev.c:5296:19: warning: unused function 'nf_ingress' [-Wunused-function]
> > 5296 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
> > | ^
> > >> net/core/dev.c:11547:2: error: call to '__compiletime_assert_971' declared with 'error' attribute: BUILD_BUG_ON failed: offsetof(struct net_device, __cacheline_group_end__net_device_read_txrx) - offsetofend(struct net_device, __cacheline_group_begin__net_device_read_txrx) > 24
> > 11547 | CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 24);
> > | ^
> > include/linux/cache.h:108:2: note: expanded from macro 'CACHELINE_ASSERT_GROUP_SIZE'
> > 108 | BUILD_BUG_ON(offsetof(TYPE, __cacheline_group_end__##GROUP) - \
> > | ^
> > include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
> > 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
> > | ^
> > include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > | ^
> > note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler_types.h:423:2: note: expanded from macro '_compiletime_assert'
> > 423 | __compiletime_assert(condition, msg, prefix, suffix)
> > | ^
> > include/linux/compiler_types.h:416:4: note: expanded from macro '__compiletime_assert'
> > 416 | prefix ## suffix(); \
> > | ^
> > <scratch space>:11:1: note: expanded from here
> > 11 | __compiletime_assert_971
> > | ^
> > 3 warnings and 1 error generated.
> >
> >
> > vim +11547 net/core/dev.c
> >
> > 11515
> > 11516 static void __init net_dev_struct_check(void)
> > 11517 {
> > 11518 /* TX read-mostly hotpath */
> > 11519 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, priv_flags);
> > 11520 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, netdev_ops);
> > 11521 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, header_ops);
> > 11522 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, _tx);
> > 11523 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, real_num_tx_queues);
> > 11524 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size);
> > 11525 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size);
> > 11526 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs);
> > 11527 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc);
> > 11528 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu);
> > 11529 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom);
> > 11530 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tc_to_txq);
> > 11531 #ifdef CONFIG_XPS
> > 11532 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, xps_maps);
> > 11533 #endif
> > 11534 #ifdef CONFIG_NETFILTER_EGRESS
> > 11535 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, nf_hooks_egress);
> > 11536 #endif
> > 11537 #ifdef CONFIG_NET_XGRESS
> > 11538 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress);
> > 11539 #endif
> > 11540 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 152);
> > 11541
> > 11542 /* TXRX read-mostly hotpath */
> > 11543 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags);
> > 11544 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len);
> > 11545 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features);
> > 11546 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr);
> > 11547 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 24);
> > 11548
> > 11549 /* RX read-mostly hotpath */
> > 11550 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific);
> > 11551 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ifindex);
> > 11552 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, real_num_rx_queues);
> > 11553 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, _rx);
> > 11554 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_flush_timeout);
> > 11555 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, napi_defer_hard_irqs);
> > 11556 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_max_size);
> > 11557 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_ipv4_max_size);
> > 11558 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler);
> > 11559 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler_data);
> > 11560 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, nd_net);
> > 11561 #ifdef CONFIG_NETPOLL
> > 11562 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, npinfo);
> > 11563 #endif
> > 11564 #ifdef CONFIG_NET_XGRESS
> > 11565 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, tcx_ingress);
> > 11566 #endif
> > 11567 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_rx, 96);
> > 11568 }
> > 11569
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
>
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