Re: [PATCHv4 bpf-next 09/25] bpf: Add bpf_trampoline_multi_attach/detach functions

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

Hi Jiri,

kernel test robot noticed the following build warnings:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Jiri-Olsa/ftrace-Add-ftrace_hash_count-function/20260326-101836
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20260324081846.2334094-10-jolsa%40kernel.org
patch subject: [PATCHv4 bpf-next 09/25] bpf: Add bpf_trampoline_multi_attach/detach functions
config: x86_64-randconfig-015-20260327 (https://download.01.org/0day-ci/archive/20260327/202603271242.rKGaiSYu-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260327/202603271242.rKGaiSYu-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/202603271242.rKGaiSYu-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/bpf/trampoline.c:100:13: warning: 'trampoline_unlock_all' defined but not used [-Wunused-function]
     100 | static void trampoline_unlock_all(void)
         |             ^~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/trampoline.c:92:13: warning: 'trampoline_lock_all' defined but not used [-Wunused-function]
      92 | static void trampoline_lock_all(void)
         |             ^~~~~~~~~~~~~~~~~~~


vim +/trampoline_unlock_all +100 kernel/bpf/trampoline.c

    91	
  > 92	static void trampoline_lock_all(void)
    93	{
    94		int i;
    95	
    96		for (i = 0; i < TRAMPOLINE_LOCKS_TABLE_SIZE; i++)
    97			mutex_lock(&trampoline_locks[i].mutex);
    98	}
    99	
 > 100	static void trampoline_unlock_all(void)
   101	{
   102		int i;
   103	
   104		for (i = 0; i < TRAMPOLINE_LOCKS_TABLE_SIZE; i++)
   105			mutex_unlock(&trampoline_locks[i].mutex);
   106	}
   107	#else
   108	static struct bpf_trampoline *direct_ops_ip_lookup(struct ftrace_ops *ops, unsigned long ip)
   109	{
   110		return ops->private;
   111	}
   112	#endif /* CONFIG_HAVE_SINGLE_FTRACE_DIRECT_OPS */
   113	

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