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Date: Wed, 5 Jun 2024 17:59:49 +0800
From: kernel test robot <lkp@...el.com>
To: Jeremy Kerr <jk@...econstruct.com.au>, David Ahern <dsahern@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] net: core: Implement dstats-type stats collections
Hi Jeremy,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 32f88d65f01bf6f45476d7edbe675e44fb9e1d58]
url: https://github.com/intel-lab-lkp/linux/commits/Jeremy-Kerr/net-core-vrf-Change-pcpu_dstat-fields-to-u64_stats_t/20240605-143942
base: 32f88d65f01bf6f45476d7edbe675e44fb9e1d58
patch link: https://lore.kernel.org/r/20240605-dstats-v1-2-1024396e1670%40codeconstruct.com.au
patch subject: [PATCH 2/3] net: core: Implement dstats-type stats collections
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20240605/202406051710.KozBBK8o-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project d7d2d4f53fc79b4b58e8d8d08151b577c3699d4a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240605/202406051710.KozBBK8o-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/202406051710.KozBBK8o-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from net/core/dev.c:80:
In file included from include/linux/sched/isolation.h:5:
In file included from include/linux/cpuset.h:17:
In file included from include/linux/mm.h:2253:
include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
In file included from net/core/dev.c:80:
In file included from include/linux/sched/isolation.h:7:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from net/core/dev.c:80:
In file included from include/linux/sched/isolation.h:7:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from net/core/dev.c:80:
In file included from include/linux/sched/isolation.h:7:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
693 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
701 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
709 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
718 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
727 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
736 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> net/core/dev.c:10871:24: warning: variable 'dstats' is uninitialized when used here [-Wuninitialized]
10871 | dstats = per_cpu_ptr(dstats, cpu);
| ^~~~~~
include/linux/percpu-defs.h:263:65: note: expanded from macro 'per_cpu_ptr'
263 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); })
| ^~~
include/linux/percpu-defs.h:260:38: note: expanded from macro 'VERIFY_PERCPU_PTR'
260 | (typeof(*(__p)) __kernel __force *)(__p); \
| ^~~
net/core/dev.c:10868:35: note: initialize the variable 'dstats' to silence this warning
10868 | const struct pcpu_dstats *dstats;
| ^
| = NULL
net/core/dev.c:4128:1: warning: unused function 'sch_handle_ingress' [-Wunused-function]
4128 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
| ^~~~~~~~~~~~~~~~~~
net/core/dev.c:4135:1: warning: unused function 'sch_handle_egress' [-Wunused-function]
4135 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
| ^~~~~~~~~~~~~~~~~
net/core/dev.c:5392:19: warning: unused function 'nf_ingress' [-Wunused-function]
5392 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
| ^~~~~~~~~~
17 warnings generated.
vim +/dstats +10871 net/core/dev.c
10851
10852 /**
10853 * dev_fetch_dstats - collate per-cpu network dstats statistics
10854 * @s: place to store stats
10855 * @dstats: per-cpu network stats to read from
10856 *
10857 * Read per-cpu network statistics from dev->dstats and populate the
10858 * related fields in @s.
10859 */
10860 void dev_fetch_dstats(struct rtnl_link_stats64 *s,
10861 const struct pcpu_dstats __percpu *dstats)
10862 {
10863 int cpu;
10864
10865 for_each_possible_cpu(cpu) {
10866 u64 rx_packets, rx_bytes, rx_drops;
10867 u64 tx_packets, tx_bytes, tx_drops;
10868 const struct pcpu_dstats *dstats;
10869 unsigned int start;
10870
10871 dstats = per_cpu_ptr(dstats, cpu);
10872 do {
10873 start = u64_stats_fetch_begin(&dstats->syncp);
10874 rx_packets = u64_stats_read(&dstats->rx_packets);
10875 rx_bytes = u64_stats_read(&dstats->rx_bytes);
10876 rx_drops = u64_stats_read(&dstats->rx_drops);
10877 tx_packets = u64_stats_read(&dstats->tx_packets);
10878 tx_bytes = u64_stats_read(&dstats->tx_bytes);
10879 tx_drops = u64_stats_read(&dstats->tx_drops);
10880 } while (u64_stats_fetch_retry(&dstats->syncp, start));
10881
10882 s->rx_packets += rx_packets;
10883 s->rx_bytes += rx_bytes;
10884 s->rx_dropped += rx_drops;
10885 s->tx_packets += tx_packets;
10886 s->tx_bytes += tx_bytes;
10887 s->tx_dropped += tx_drops;
10888 }
10889 }
10890 EXPORT_SYMBOL_GPL(dev_fetch_dstats);
10891
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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