Re: [PATCH bpf-next] bpf: make the attach target more accurate

[kernel test robot]

Hi Menglong,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Menglong-Dong/bpf-make-the-attach-target-more-accurate/20250707-194159
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20250707113528.378303-1-dongml2%40chinatelecom.cn
patch subject: [PATCH bpf-next] bpf: make the attach target more accurate
config: i386-buildonly-randconfig-003-20250708 (https://download.01.org/0day-ci/archive/20250708/202507080452.fCL471ap-lkp@xxxxxxxxx/config)
compiler: clang version 20.1.7 (https://github.com/llvm/llvm-project 6146a88f60492b520a36f8f8f3231e15f3cc6082)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250708/202507080452.fCL471ap-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507080452.fCL471ap-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> kernel/bpf/verifier.c:23491:43: error: incomplete definition of type 'const struct module'
    23491 |                 err = module_kallsyms_on_each_symbol(mod->name, symbol_mod_callback,
          |                                                      ~~~^
   include/linux/printk.h:400:8: note: forward declaration of 'struct module'
     400 | struct module;
         |        ^
   1 error generated.


vim +23491 kernel/bpf/verifier.c

 23466	
 23467	/**
 23468	 * bpf_lookup_attach_addr: Lookup address for a symbol
 23469	 *
 23470	 * @mod: kernel module to lookup the symbol, NULL means to lookup the kernel
 23471	 * symbols
 23472	 * @sym: the symbol to resolve
 23473	 * @addr: pointer to store the result
 23474	 *
 23475	 * Lookup the address of the symbol @sym, and the address should has
 23476	 * corresponding ftrace location. If multiple symbols with the name @sym
 23477	 * exist, the one that has ftrace location will be returned. If more than
 23478	 * 1 has ftrace location, -EADDRNOTAVAIL will be returned.
 23479	 *
 23480	 * Returns: 0 on success, -errno otherwise.
 23481	 */
 23482	static int bpf_lookup_attach_addr(const struct module *mod, const char *sym,
 23483					  unsigned long *addr)
 23484	{
 23485		struct symbol_lookup_ctx ctx = { .addr = 0, .name = sym };
 23486		int err;
 23487	
 23488		if (!mod)
 23489			err = kallsyms_on_each_match_symbol(symbol_callback, sym, &ctx);
 23490		else
 23491			err = module_kallsyms_on_each_symbol(mod->name, symbol_mod_callback,
 23492							     &ctx);
 23493	
 23494		if (!ctx.addr)
 23495			return -ENOENT;
 23496	
 23497		if (err)
 23498			return err;
 23499	
 23500		*addr = ctx.addr;
 23501	
 23502		return 0;
 23503	}
 23504	

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