Re: [PATCH bpf-next v2 2/7] bpf: Implement bpf_probe_read_user_dynptr helper

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

Hi Levi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d0d106a2bd21499901299160744e5fe9f4c83ddb]

url:    https://github.com/intel-lab-lkp/linux/commits/Levi-Zim-via-B4-Relay/bpf-Implement-bpf_probe_read_kernel_dynptr-helper/20250125-163114
base:   d0d106a2bd21499901299160744e5fe9f4c83ddb
patch link:    https://lore.kernel.org/r/20250125-bpf_dynptr_probe-v2-2-c42c87f97afe%40outlook.com
patch subject: [PATCH bpf-next v2 2/7] bpf: Implement bpf_probe_read_user_dynptr helper
config: x86_64-randconfig-122-20250127 (https://download.01.org/0day-ci/archive/20250127/202501272059.wikSvChi-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250127/202501272059.wikSvChi-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/202501272059.wikSvChi-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/trace/bpf_trace.c:899:41: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __user *[addressable] [assigned] [usertype] sival_ptr @@     got void * @@
   kernel/trace/bpf_trace.c:899:41: sparse:     expected void [noderef] __user *[addressable] [assigned] [usertype] sival_ptr
   kernel/trace/bpf_trace.c:899:41: sparse:     got void *
>> kernel/trace/bpf_trace.c:235:39: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void const [noderef] __user *unsafe_ptr @@     got void *unsafe_ptr @@
   kernel/trace/bpf_trace.c:235:39: sparse:     expected void const [noderef] __user *unsafe_ptr
   kernel/trace/bpf_trace.c:235:39: sparse:     got void *unsafe_ptr
   kernel/trace/bpf_trace.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   kernel/trace/bpf_trace.c: note: in included file (through include/linux/rbtree.h, include/linux/mm_types.h, include/linux/mmzone.h, ...):
   include/linux/rcupdate.h:880:25: sparse: sparse: context imbalance in 'uprobe_prog_run' - unexpected unlock

vim +235 kernel/trace/bpf_trace.c

   228	
   229	BPF_CALL_5(bpf_probe_read_user_dynptr, const struct bpf_dynptr_kern *, dst,
   230		u32, offset, u32, size, void *, unsafe_ptr, u64, flags)
   231	{
   232		int ret = bpf_probe_read_check_dynptr(dst, offset, size, flags);
   233	
   234		return ret ?: bpf_probe_read_user_common(dst->data + dst->offset + offset,
 > 235					size, unsafe_ptr);
   236	}
   237	

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