linux-kernel - Re: [PATCH bpf-next v2 6/6] bpf: implement "jmp" mode for trampoline

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Message-ID: <202511180613.Om7k1nP1-lkp@intel.com>
Date: Tue, 18 Nov 2025 06:49:40 +0800
From: kernel test robot <lkp@...el.com>
To: Menglong Dong <menglong8.dong@...il.com>, ast@...nel.org,
	rostedt@...dmis.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	daniel@...earbox.net, john.fastabend@...il.com, andrii@...nel.org,
	martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
	yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
	haoluo@...gle.com, jolsa@...nel.org, mhiramat@...nel.org,
	mark.rutland@....com, mathieu.desnoyers@...icios.com,
	jiang.biao@...ux.dev, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 6/6] bpf: implement "jmp" mode for trampoline

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/ftrace-introduce-FTRACE_OPS_FL_JMP/20251117-115243
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20251117034906.32036-7-dongml2%40chinatelecom.cn
patch subject: [PATCH bpf-next v2 6/6] bpf: implement "jmp" mode for trampoline
config: arm64-randconfig-002-20251118 (https://download.01.org/0day-ci/archive/20251118/202511180613.Om7k1nP1-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251118/202511180613.Om7k1nP1-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/202511180613.Om7k1nP1-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/bpf/trampoline.c:500:11: error: incomplete definition of type 'struct ftrace_ops'
     500 |                 tr->fops->flags |= FTRACE_OPS_FL_JMP;
         |                 ~~~~~~~~^
   include/linux/ftrace.h:40:8: note: forward declaration of 'struct ftrace_ops'
      40 | struct ftrace_ops;
         |        ^
>> kernel/bpf/trampoline.c:500:22: error: use of undeclared identifier 'FTRACE_OPS_FL_JMP'
     500 |                 tr->fops->flags |= FTRACE_OPS_FL_JMP;
         |                                    ^~~~~~~~~~~~~~~~~
   kernel/bpf/trampoline.c:502:11: error: incomplete definition of type 'struct ftrace_ops'
     502 |                 tr->fops->flags &= ~FTRACE_OPS_FL_JMP;
         |                 ~~~~~~~~^
   include/linux/ftrace.h:40:8: note: forward declaration of 'struct ftrace_ops'
      40 | struct ftrace_ops;
         |        ^
   kernel/bpf/trampoline.c:502:23: error: use of undeclared identifier 'FTRACE_OPS_FL_JMP'
     502 |                 tr->fops->flags &= ~FTRACE_OPS_FL_JMP;
         |                                     ^~~~~~~~~~~~~~~~~
   kernel/bpf/trampoline.c:534:12: error: incomplete definition of type 'struct ftrace_ops'
     534 |                         tr->fops->flags |= FTRACE_OPS_FL_JMP;
         |                         ~~~~~~~~^
   include/linux/ftrace.h:40:8: note: forward declaration of 'struct ftrace_ops'
      40 | struct ftrace_ops;
         |        ^
   kernel/bpf/trampoline.c:534:23: error: use of undeclared identifier 'FTRACE_OPS_FL_JMP'
     534 |                         tr->fops->flags |= FTRACE_OPS_FL_JMP;
         |                                            ^~~~~~~~~~~~~~~~~
   kernel/bpf/trampoline.c:536:12: error: incomplete definition of type 'struct ftrace_ops'
     536 |                         tr->fops->flags &= ~FTRACE_OPS_FL_JMP;
         |                         ~~~~~~~~^
   include/linux/ftrace.h:40:8: note: forward declaration of 'struct ftrace_ops'
      40 | struct ftrace_ops;
         |        ^
   kernel/bpf/trampoline.c:536:24: error: use of undeclared identifier 'FTRACE_OPS_FL_JMP'
     536 |                         tr->fops->flags &= ~FTRACE_OPS_FL_JMP;
         |                                             ^~~~~~~~~~~~~~~~~
   8 errors generated.


vim +/FTRACE_OPS_FL_JMP +500 kernel/bpf/trampoline.c

   470	
   471		size = arch_bpf_trampoline_size(&tr->func.model, tr->flags,
   472						tlinks, tr->func.addr);
   473		if (size < 0) {
   474			err = size;
   475			goto out;
   476		}
   477	
   478		if (size > PAGE_SIZE) {
   479			err = -E2BIG;
   480			goto out;
   481		}
   482	
   483		im = bpf_tramp_image_alloc(tr->key, size);
   484		if (IS_ERR(im)) {
   485			err = PTR_ERR(im);
   486			goto out;
   487		}
   488	
   489		err = arch_prepare_bpf_trampoline(im, im->image, im->image + size,
   490						  &tr->func.model, tr->flags, tlinks,
   491						  tr->func.addr);
   492		if (err < 0)
   493			goto out_free;
   494	
   495		err = arch_protect_bpf_trampoline(im->image, im->size);
   496		if (err)
   497			goto out_free;
   498	
   499		if (bpf_trampoline_use_jmp(tr->flags))
 > 500			tr->fops->flags |= FTRACE_OPS_FL_JMP;
   501		else
   502			tr->fops->flags &= ~FTRACE_OPS_FL_JMP;
   503	
   504		WARN_ON(tr->cur_image && total == 0);
   505		if (tr->cur_image)
   506			/* progs already running at this address */
   507			err = modify_fentry(tr, orig_flags, tr->cur_image->image,
   508					    im->image, lock_direct_mutex);
   509		else
   510			/* first time registering */
   511			err = register_fentry(tr, im->image);
   512	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki