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Date: Thu, 11 Feb 2021 08:19:25 +0800
From: kernel test robot <lkp@...el.com>
To: Alexander Lobakin <alobakin@...me>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
netdev@...r.kernel.org, Jonathan Lemon <jonathan.lemon@...il.com>,
Eric Dumazet <edumazet@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Willem de Bruijn <willemb@...gle.com>,
Alexander Lobakin <alobakin@...me>,
Randy Dunlap <rdunlap@...radead.org>,
Kevin Hao <haokexin@...il.com>
Subject: Re: [PATCH v4 net-next 06/11] skbuff: remove __kfree_skb_flush()
Hi Alexander,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on net-next/master]
url: https://github.com/0day-ci/linux/commits/Alexander-Lobakin/skbuff-introduce-skbuff_heads-bulking-and-reusing/20210211-004041
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git de1db4a6ed6241e34cab0e5059d4b56f6bae39b9
config: s390-randconfig-r025-20210209 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://github.com/0day-ci/linux/commit/6bb224307d9f31afa154a8825f9acbd8e9f6b490
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Alexander-Lobakin/skbuff-introduce-skbuff_heads-bulking-and-reusing/20210211-004041
git checkout 6bb224307d9f31afa154a8825f9acbd8e9f6b490
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:80:
include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
^
In file included from net/core/dev.c:89:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:80:
include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
^
In file included from net/core/dev.c:89:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:80:
include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32'
(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
^
In file included from net/core/dev.c:89:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:80:
include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32'
__fswab32(x))
^
In file included from net/core/dev.c:89:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:80:
include/asm-generic/io.h:501:33: 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:511:59: 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:521:59: 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:609:20: 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:617:20: 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:625:20: 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:634:21: 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:643:21: 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:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> net/core/dev.c:7012:4: error: implicit declaration of function '__kfree_skb_flush' [-Werror,-Wimplicit-function-declaration]
__kfree_skb_flush();
^
20 warnings and 1 error generated.
vim +/__kfree_skb_flush +7012 net/core/dev.c
29863d41bb6e1d Wei Wang 2021-02-08 6996
29863d41bb6e1d Wei Wang 2021-02-08 6997 static int napi_threaded_poll(void *data)
29863d41bb6e1d Wei Wang 2021-02-08 6998 {
29863d41bb6e1d Wei Wang 2021-02-08 6999 struct napi_struct *napi = data;
29863d41bb6e1d Wei Wang 2021-02-08 7000 void *have;
29863d41bb6e1d Wei Wang 2021-02-08 7001
29863d41bb6e1d Wei Wang 2021-02-08 7002 while (!napi_thread_wait(napi)) {
29863d41bb6e1d Wei Wang 2021-02-08 7003 for (;;) {
29863d41bb6e1d Wei Wang 2021-02-08 7004 bool repoll = false;
29863d41bb6e1d Wei Wang 2021-02-08 7005
29863d41bb6e1d Wei Wang 2021-02-08 7006 local_bh_disable();
29863d41bb6e1d Wei Wang 2021-02-08 7007
29863d41bb6e1d Wei Wang 2021-02-08 7008 have = netpoll_poll_lock(napi);
29863d41bb6e1d Wei Wang 2021-02-08 7009 __napi_poll(napi, &repoll);
29863d41bb6e1d Wei Wang 2021-02-08 7010 netpoll_poll_unlock(have);
29863d41bb6e1d Wei Wang 2021-02-08 7011
29863d41bb6e1d Wei Wang 2021-02-08 @7012 __kfree_skb_flush();
29863d41bb6e1d Wei Wang 2021-02-08 7013 local_bh_enable();
29863d41bb6e1d Wei Wang 2021-02-08 7014
29863d41bb6e1d Wei Wang 2021-02-08 7015 if (!repoll)
29863d41bb6e1d Wei Wang 2021-02-08 7016 break;
29863d41bb6e1d Wei Wang 2021-02-08 7017
29863d41bb6e1d Wei Wang 2021-02-08 7018 cond_resched();
29863d41bb6e1d Wei Wang 2021-02-08 7019 }
29863d41bb6e1d Wei Wang 2021-02-08 7020 }
29863d41bb6e1d Wei Wang 2021-02-08 7021 return 0;
29863d41bb6e1d Wei Wang 2021-02-08 7022 }
29863d41bb6e1d Wei Wang 2021-02-08 7023
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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