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Date: Wed, 21 Feb 2024 11:32:33 +0800
From: kernel test robot <lkp@intel.com>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [gustavoars:testing/WFAMNAE-next20240215 1/1]
 kernel/bpf/core.c:2440:22: warning: comparison of distinct pointer types
 ('struct bpf_prog_array *' and 'struct bpf_prog_array_hdr *')
Message-ID: <202402211137.ShMIWxpm-lkp@intel.com>
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/WFAMNAE-next20240215
head:   b50c399b249bcb0fdc709e812b4e87519937299d
commit: 3fedbc527c5726b876207557fb133a5e558c1898 [1/1] treewide: Address -Wflexible-array-member-not-at-end warnings
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20240221/202402211137.ShMIWxpm-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 36adfec155de366d722f2bac8ff9162289dcf06c)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240221/202402211137.ShMIWxpm-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402211137.ShMIWxpm-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/bpf/core.c:21:
   In file included from include/linux/filter.h:9:
   In file included from include/linux/bpf.h:31:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   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]
     547 |         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]
     560 |         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 kernel/bpf/core.c:21:
   In file included from include/linux/filter.h:9:
   In file included from include/linux/bpf.h:31:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   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]
     573 |         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 kernel/bpf/core.c:21:
   In file included from include/linux/filter.h:9:
   In file included from include/linux/bpf.h:31:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   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]
     584 |         __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]
     594 |         __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]
     604 |         __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]
     692 |         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]
     700 |         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]
     708 |         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]
     717 |         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]
     726 |         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]
     735 |         writesl(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
>> kernel/bpf/core.c:2440:22: warning: comparison of distinct pointer types ('struct bpf_prog_array *' and 'struct bpf_prog_array_hdr *') [-Wcompare-distinct-pointer-types]
    2440 |         if (!progs || progs == &bpf_empty_prog_array.hdr)
         |                       ~~~~~ ^  ~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/core.c:2461:22: warning: comparison of distinct pointer types ('struct bpf_prog_array *' and 'struct bpf_prog_array_hdr *') [-Wcompare-distinct-pointer-types]
    2461 |         if (!progs || progs == &bpf_empty_prog_array.hdr)
         |                       ~~~~~ ^  ~~~~~~~~~~~~~~~~~~~~~~~~~
   14 warnings generated.


vim +2440 kernel/bpf/core.c

324bda9e6c5add Alexei Starovoitov 2017-10-02  2437  
54e9c9d4b506b6 Stanislav Fomichev 2019-05-28  2438  void bpf_prog_array_free(struct bpf_prog_array *progs)
324bda9e6c5add Alexei Starovoitov 2017-10-02  2439  {
46531a30364bd4 Pavel Begunkov     2022-01-27 @2440  	if (!progs || progs == &bpf_empty_prog_array.hdr)
324bda9e6c5add Alexei Starovoitov 2017-10-02  2441  		return;
324bda9e6c5add Alexei Starovoitov 2017-10-02  2442  	kfree_rcu(progs, rcu);
324bda9e6c5add Alexei Starovoitov 2017-10-02  2443  }
324bda9e6c5add Alexei Starovoitov 2017-10-02  2444  

:::::: The code at line 2440 was first introduced by commit
:::::: 46531a30364bd483bfa1b041c15d42a196e77e93 cgroup/bpf: fast path skb BPF filtering

:::::: TO: Pavel Begunkov <asml.silence@gmail.com>
:::::: CC: Alexei Starovoitov <ast@kernel.org>

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