linux-kernel - [gustavoars:testing/wfamnae-next20250424 1/25] kernel/bpf/core.c:2576:22: warning: comparison of distinct pointer types lacks a cast

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Message-ID: <202505291933.IiIYX6Xj-lkp@intel.com>
Date: Thu, 29 May 2025 19:00:51 +0800
From: kernel test robot <lkp@...el.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [gustavoars:testing/wfamnae-next20250424 1/25]
 kernel/bpf/core.c:2576:22: warning: comparison of distinct pointer types
 lacks a cast

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20250424
head:   604833e5a102945aa4596b80085ef9cada5e6d57
commit: 117d6f3024817bf22efc8b81679e0b282ca9cc07 [1/25] treewide_some: fix multiple -Wfamnae warnings that must be audited separately
config: alpha-randconfig-2006-20250504 (https://download.01.org/0day-ci/archive/20250529/202505291933.IiIYX6Xj-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250529/202505291933.IiIYX6Xj-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/202505291933.IiIYX6Xj-lkp@intel.com/

All warnings (new ones prefixed by >>):

   cc1: note: -Wvla-larger-than=0 is meaningless
   kernel/bpf/core.c: In function 'bpf_prog_array_free_sleepable':
>> kernel/bpf/core.c:2576:22: warning: comparison of distinct pointer types lacks a cast
     if (!progs || progs == &bpf_empty_prog_array.hdr)
                         ^~


vim +2576 kernel/bpf/core.c

8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2573  
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2574  void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2575  {
8c7dcb84e3b744 Delyan Kratunov 2022-06-14 @2576  	if (!progs || progs == &bpf_empty_prog_array.hdr)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2577  		return;
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2578  	call_rcu_tasks_trace(&progs->rcu, __bpf_prog_array_free_sleepable_cb);
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2579  }
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2580  

:::::: The code at line 2576 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