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Message-ID: <202403292036.FloftiJL-lkp@intel.com>
Date: Fri, 29 Mar 2024 20:29:35 +0800
From: kernel test robot <lkp@...el.com>
To: Eric Dumazet <edumazet@...gle.com>,
"David S . Miller" <davem@...emloft.net>,
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, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 6/8] net: rps: change
input_queue_tail_incr_save()
Hi Eric,
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/Eric-Dumazet/net-move-kick_defer_list_purge-to-net-core-dev-h/20240329-011413
base: net-next/main
patch link: https://lore.kernel.org/r/20240328170309.2172584-7-edumazet%40google.com
patch subject: [PATCH net-next 6/8] net: rps: change input_queue_tail_incr_save()
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20240329/202403292036.FloftiJL-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403292036.FloftiJL-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/202403292036.FloftiJL-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from net/core/dev.c:89:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
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'
#define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
^
In file included from net/core/dev.c:89:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
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'
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
^
In file included from net/core/dev.c:89:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> net/core/dev.c:4819:10: error: call to undeclared function 'rps_input_queue_tail_incr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
tail = rps_input_queue_tail_incr(sd);
^
>> net/core/dev.c:4823:3: error: call to undeclared function 'rps_input_queue_tail_save'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
rps_input_queue_tail_save(qtail, tail);
^
>> net/core/dev.c:5901:4: error: call to undeclared function 'rps_input_queue_head_incr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
rps_input_queue_head_incr(sd);
^
net/core/dev.c:5910:4: error: call to undeclared function 'rps_input_queue_head_incr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
rps_input_queue_head_incr(sd);
^
net/core/dev.c:6038:4: error: call to undeclared function 'rps_input_queue_head_incr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
rps_input_queue_head_incr(sd);
^
net/core/dev.c:11452:3: error: call to undeclared function 'rps_input_queue_head_incr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
rps_input_queue_head_incr(oldsd);
^
net/core/dev.c:11456:3: error: call to undeclared function 'rps_input_queue_head_incr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
rps_input_queue_head_incr(oldsd);
^
12 warnings and 7 errors generated.
vim +/rps_input_queue_tail_incr +4819 net/core/dev.c
4781
4782 /*
4783 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
4784 * queue (may be a remote CPU queue).
4785 */
4786 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
4787 unsigned int *qtail)
4788 {
4789 enum skb_drop_reason reason;
4790 struct softnet_data *sd;
4791 unsigned long flags;
4792 unsigned int qlen;
4793 int max_backlog;
4794 u32 tail;
4795
4796 reason = SKB_DROP_REASON_DEV_READY;
4797 if (!netif_running(skb->dev))
4798 goto bad_dev;
4799
4800 reason = SKB_DROP_REASON_CPU_BACKLOG;
4801 sd = &per_cpu(softnet_data, cpu);
4802
4803 qlen = skb_queue_len_lockless(&sd->input_pkt_queue);
4804 max_backlog = READ_ONCE(net_hotdata.max_backlog);
4805 if (unlikely(qlen > max_backlog))
4806 goto cpu_backlog_drop;
4807 backlog_lock_irq_save(sd, &flags);
4808 qlen = skb_queue_len(&sd->input_pkt_queue);
4809 if (qlen <= max_backlog && !skb_flow_limit(skb, qlen)) {
4810 if (!qlen) {
4811 /* Schedule NAPI for backlog device. We can use
4812 * non atomic operation as we own the queue lock.
4813 */
4814 if (!__test_and_set_bit(NAPI_STATE_SCHED,
4815 &sd->backlog.state))
4816 napi_schedule_rps(sd);
4817 }
4818 __skb_queue_tail(&sd->input_pkt_queue, skb);
> 4819 tail = rps_input_queue_tail_incr(sd);
4820 backlog_unlock_irq_restore(sd, &flags);
4821
4822 /* save the tail outside of the critical section */
> 4823 rps_input_queue_tail_save(qtail, tail);
4824 return NET_RX_SUCCESS;
4825 }
4826
4827 backlog_unlock_irq_restore(sd, &flags);
4828
4829 cpu_backlog_drop:
4830 atomic_inc(&sd->dropped);
4831 bad_dev:
4832 dev_core_stats_rx_dropped_inc(skb->dev);
4833 kfree_skb_reason(skb, reason);
4834 return NET_RX_DROP;
4835 }
4836
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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