linux-kernel - [gustavoars:testing/wfamnae-next20241003 14/14] kernel/bpf/core.c:2505:22: warning: comparison of distinct pointer types ('struct bpf_prog_array *' and 'struct bpf_prog_array

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Message-ID: <202410050215.8zVNACRw-lkp@intel.com>
Date: Sat, 5 Oct 2024 02:18:44 +0800
From: kernel test robot <lkp@...el.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [gustavoars:testing/wfamnae-next20241003 14/14]
 kernel/bpf/core.c:2505:22: warning: comparison of distinct pointer types
 ('struct bpf_prog_array *' and 'struct bpf_prog_array_hdr *')

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20241003
head:   ec64acf2dce7577a42c01241e78b24afebc26e96
commit: ec64acf2dce7577a42c01241e78b24afebc26e96 [14/14] treewide_some: fix multiple -Wfamnae warnings that must be audited separately
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241005/202410050215.8zVNACRw-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241005/202410050215.8zVNACRw-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/202410050215.8zVNACRw-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/bpf/core.c:2505:22: warning: comparison of distinct pointer types ('struct bpf_prog_array *' and 'struct bpf_prog_array_hdr *') [-Wcompare-distinct-pointer-types]
    2505 |         if (!progs || progs == &bpf_empty_prog_array.hdr)
         |                       ~~~~~ ^  ~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +2505 kernel/bpf/core.c

8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2502  
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2503  void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2504  {
8c7dcb84e3b744 Delyan Kratunov 2022-06-14 @2505  	if (!progs || progs == &bpf_empty_prog_array.hdr)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2506  		return;
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2507  	call_rcu_tasks_trace(&progs->rcu, __bpf_prog_array_free_sleepable_cb);
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2508  }
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2509  

:::::: The code at line 2505 was first introduced by commit
:::::: 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 bpf: implement sleepable uprobes by chaining gps

:::::: TO: Delyan Kratunov <delyank@...com>
:::::: CC: Alexei Starovoitov <ast@...nel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki