linux-kernel - [gustavoars:testing/wfamnae-next20241015-2 13/18] kernel/bpf/core.c:2505:29: sparse: sparse: incompatible types in comparison expression (different base types):

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Message-ID: <202410172103.ZqzfeZN1-lkp@intel.com>
Date: Thu, 17 Oct 2024 21:22:03 +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-next20241015-2 13/18]
 kernel/bpf/core.c:2505:29: sparse: sparse: incompatible types in comparison
 expression (different base types):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20241015-2
head:   41fe8a04339b3781dca5a8ba323ba77022acc441
commit: ad5262bdaed765f2f59e1db0a1361e7bd6dac847 [13/18] treewide_some: fix multiple -Wfamnae warnings that must be audited separately
config: x86_64-randconfig-123-20241017 (https://download.01.org/0day-ci/archive/20241017/202410172103.ZqzfeZN1-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/20241017/202410172103.ZqzfeZN1-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/202410172103.ZqzfeZN1-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/bpf/core.c:242:49: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2010:43: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2015:48: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2283:77: sparse: sparse: subtraction of functions? Share your drugs
>> kernel/bpf/core.c:2505:29: sparse: sparse: incompatible types in comparison expression (different base types):
   kernel/bpf/core.c:2505:29: sparse:    struct bpf_prog_array *
   kernel/bpf/core.c:2505:29: sparse:    struct bpf_prog_array_hdr *
   kernel/bpf/core.c: note: in included file (through include/trace/trace_events.h, include/trace/define_trace.h, include/trace/events/xdp.h, ...):
   include/trace/events/xdp.h:321:1: sparse: sparse: Using plain integer as NULL pointer
   include/trace/events/xdp.h:348:1: sparse: sparse: Using plain integer as NULL pointer
   include/trace/events/xdp.h:382:1: sparse: sparse: Using plain integer as NULL pointer

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