[gustavoars:testing/wfamnae-next20251212 21/21] kernel/bpf/core.c:2624:29: sparse: sparse: incompatible types in comparison expression (different base types):

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20251212
head:   c3cc47915438797b3342f426772472b7c3dee6df
commit: c3cc47915438797b3342f426772472b7c3dee6df [21/21] treewide_some: fix multiple -Wfamnae warnings that must be audited separately
config: s390-randconfig-r112-20251213 (https://download.01.org/0day-ci/archive/20251213/202512132156.6jTMbPEC-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 1335a05ab8bc8339ce24be3a9da89d8c3f4e0571)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251213/202512132156.6jTMbPEC-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/202512132156.6jTMbPEC-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/bpf/core.c:250:49: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2037:43: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2042:48: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2363:77: sparse: sparse: subtraction of functions? Share your drugs
>> kernel/bpf/core.c:2624:29: sparse: sparse: incompatible types in comparison expression (different base types):
   kernel/bpf/core.c:2624:29: sparse:    struct bpf_prog_array *
   kernel/bpf/core.c:2624:29: 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:304:1: sparse: sparse: Using plain integer as NULL pointer
   include/trace/events/xdp.h:331:1: 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:102:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:102:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:102:9: sparse:    struct rb_node *
   include/linux/rbtree.h:102:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:102:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:102:9: sparse:    struct rb_node *

vim +2624 kernel/bpf/core.c

8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2621  
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2622  void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2623  {
8c7dcb84e3b744 Delyan Kratunov 2022-06-14 @2624  	if (!progs || progs == &bpf_empty_prog_array.hdr)
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2625  		return;
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2626  	call_rcu_tasks_trace(&progs->rcu, __bpf_prog_array_free_sleepable_cb);
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2627  }
8c7dcb84e3b744 Delyan Kratunov 2022-06-14  2628  

:::::: The code at line 2624 was first introduced by commit
:::::: 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 bpf: implement sleepable uprobes by chaining gps

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

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