linux-kernel - [gustavoars:testing/wfamnae-next20250124 15/15] kernel/bpf/core.c:2510:29: sparse: sparse: incompatible types in comparison expression (different base types):

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Message-ID: <202501281414.ABnepGOJ-lkp@intel.com>
Date: Tue, 28 Jan 2025 14:10:52 +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-next20250124 15/15]
 kernel/bpf/core.c:2510:29: 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-next20250124
head:   86b653e4edef7b0f7b7afe5dd8e0241fc1165238
commit: 9fcf89847632bd963953b2f945fb3ce2277f1f97 [15/15] treewide_some: fix multiple -Wfamnae warnings that must be audited separately
config: i386-randconfig-062-20250128 (https://download.01.org/0day-ci/archive/20250128/202501281414.ABnepGOJ-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250128/202501281414.ABnepGOJ-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/202501281414.ABnepGOJ-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/bpf/core.c:243:49: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2015:43: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2020:48: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2288:77: sparse: sparse: subtraction of functions? Share your drugs
>> kernel/bpf/core.c:2510:29: sparse: sparse: incompatible types in comparison expression (different base types):
   kernel/bpf/core.c:2510:29: sparse:    struct bpf_prog_array *
   kernel/bpf/core.c:2510:29: 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
   kernel/bpf/core.c: note: in included file (through include/linux/rbtree_latch.h, include/linux/bpf.h, include/linux/filter.h):
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *

vim +2510 kernel/bpf/core.c

8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2507  
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2508  void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2509  {
8c7dcb84e3b744 Delyan Kratunov 2022-06-14 @2510  	if (!progs || progs == &bpf_empty_prog_array.hdr)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2511  		return;
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2512  	call_rcu_tasks_trace(&progs->rcu, __bpf_prog_array_free_sleepable_cb);
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2513  }
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2514  

:::::: The code at line 2510 was first introduced by commit
:::::: 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 bpf: implement sleepable uprobes by chaining gps

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

-- 
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https://github.com/intel/lkp-tests/wiki