kernel/bpf/core.c:183:49: sparse: error: arithmetics on pointers to functions

kernel/bpf/core.c:183:49: sparse: error: arithmetics on pointers to functions

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   12ad143e1b803e541e48b8ba40f550250259ecdd
commit: c454a46b5efd8eff8880e88ece2976e60a26bf35 bpf: Add bpf_line_info support
date:   3 months ago
reproduce:
        # apt-get install sparse
        git checkout c454a46b5efd8eff8880e88ece2976e60a26bf35
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

All errors (new ones prefixed by >>):

   include/linux/slab.h:332:43: sparse: warning: dubious: x & !y
   include/linux/slab.h:332:43: sparse: warning: dubious: x & !y
>> kernel/bpf/core.c:183:49: sparse: error: arithmetics on pointers to functions
   kernel/bpf/core.c:733:6: sparse: warning: symbol 'bpf_jit_alloc_exec' was not declared. Should it be static?
   kernel/bpf/core.c:738:13: sparse: warning: symbol 'bpf_jit_free_exec' was not declared. Should it be static?
   include/linux/slab.h:332:43: sparse: warning: dubious: x & !y
   kernel/bpf/core.c:1778:9: sparse: warning: incorrect type in argument 1 (different address spaces)
   kernel/bpf/core.c:1778:9: sparse:    expected struct callback_head *head
   kernel/bpf/core.c:1778:9: sparse:    got struct callback_head [noderef] <asn:4> *
   include/linux/slab.h:332:43: sparse: warning: dubious: x & !y
   kernel/bpf/core.c:1852:44: sparse: warning: incorrect type in initializer (different address spaces)
   kernel/bpf/core.c:1852:44: sparse:    expected struct bpf_prog_array_item *item
   kernel/bpf/core.c:1852:44: sparse:    got struct bpf_prog_array_item [noderef] <asn:4> *
   kernel/bpf/core.c:1876:26: sparse: warning: incorrect type in assignment (different address spaces)
   kernel/bpf/core.c:1876:26: sparse:    expected struct bpf_prog_array_item *existing
   kernel/bpf/core.c:1876:26: sparse:    got struct bpf_prog_array_item [noderef] <asn:4> *
   kernel/bpf/core.c:1910:26: sparse: warning: incorrect type in assignment (different address spaces)
   kernel/bpf/core.c:1910:26: sparse:    expected struct bpf_prog_array_item *[assigned] existing
   kernel/bpf/core.c:1910:26: sparse:    got struct bpf_prog_array_item [noderef] <asn:4> *
   include/trace/events/xdp.h:28:1: sparse: warning: Using plain integer as NULL pointer
   include/trace/events/xdp.h:53:1: sparse: warning: Using plain integer as NULL pointer
   include/trace/events/xdp.h:111:1: sparse: warning: Using plain integer as NULL pointer
   include/trace/events/xdp.h:126:1: sparse: warning: Using plain integer as NULL pointer
   include/trace/events/xdp.h:161:1: sparse: warning: Using plain integer as NULL pointer
   include/trace/events/xdp.h:196:1: sparse: warning: Using plain integer as NULL pointer
   include/trace/events/xdp.h:231:1: sparse: warning: Using plain integer as NULL pointer
   kernel/bpf/core.c:1156:18: sparse: warning: Initializer entry defined twice
   kernel/bpf/core.c:1158:17: sparse:   also defined here

vim +183 kernel/bpf/core.c

   133	
   134	/* The jit engine is responsible to provide an array
   135	 * for insn_off to the jited_off mapping (insn_to_jit_off).
   136	 *
   137	 * The idx to this array is the insn_off.  Hence, the insn_off
   138	 * here is relative to the prog itself instead of the main prog.
   139	 * This array has one entry for each xlated bpf insn.
   140	 *
   141	 * jited_off is the byte off to the last byte of the jited insn.
   142	 *
   143	 * Hence, with
   144	 * insn_start:
   145	 *      The first bpf insn off of the prog.  The insn off
   146	 *      here is relative to the main prog.
   147	 *      e.g. if prog is a subprog, insn_start > 0
   148	 * linfo_idx:
   149	 *      The prog's idx to prog->aux->linfo and jited_linfo
   150	 *
   151	 * jited_linfo[linfo_idx] = prog->bpf_func
   152	 *
   153	 * For i > linfo_idx,
   154	 *
   155	 * jited_linfo[i] = prog->bpf_func +
   156	 *	insn_to_jit_off[linfo[i].insn_off - insn_start - 1]
   157	 */
   158	void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
   159				       const u32 *insn_to_jit_off)
   160	{
   161		u32 linfo_idx, insn_start, insn_end, nr_linfo, i;
   162		const struct bpf_line_info *linfo;
   163		void **jited_linfo;
   164	
   165		if (!prog->aux->jited_linfo)
   166			/* Userspace did not provide linfo */
   167			return;
   168	
   169		linfo_idx = prog->aux->linfo_idx;
   170		linfo = &prog->aux->linfo[linfo_idx];
   171		insn_start = linfo[0].insn_off;
   172		insn_end = insn_start + prog->len;
   173	
   174		jited_linfo = &prog->aux->jited_linfo[linfo_idx];
   175		jited_linfo[0] = prog->bpf_func;
   176	
   177		nr_linfo = prog->aux->nr_linfo - linfo_idx;
   178	
   179		for (i = 1; i < nr_linfo && linfo[i].insn_off < insn_end; i++)
   180			/* The verifier ensures that linfo[i].insn_off is
   181			 * strictly increasing
   182			 */
 > 183			jited_linfo[i] = prog->bpf_func +
   184				insn_to_jit_off[linfo[i].insn_off - insn_start - 1];
   185	}
   186	

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