linux-kernel - [jolsa-perf:bpf/tracing_multi_4 23/35] kernel/bpf/trampoline.c:1074:16: error: implicit declaration of function 'ftrace_hash

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Date:   Fri, 29 Jul 2022 22:19:07 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [jolsa-perf:bpf/tracing_multi_4 23/35]
 kernel/bpf/trampoline.c:1074:16: error: implicit declaration of function
 'ftrace_hash_alloc'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tracing_multi_4
head:   a63fc296e166a76b3f7250a966df4651e3a846f1
commit: 8544251d2b26ab91f208df1c72259b909968b9a8 [23/35] bpf: Add support to attach multi trampolines
config: x86_64-randconfig-a006 (https://download.01.org/0day-ci/archive/20220729/202207292200.qt0ol0Ov-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=8544251d2b26ab91f208df1c72259b909968b9a8
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/tracing_multi_4
        git checkout 8544251d2b26ab91f208df1c72259b909968b9a8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/bpf/trampoline.c: In function 'bpf_tramp_update_set':
>> kernel/bpf/trampoline.c:1074:16: error: implicit declaration of function 'ftrace_hash_alloc' [-Werror=implicit-function-declaration]
    1074 |         hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
         |                ^~~~~~~~~~~~~~~~~
>> kernel/bpf/trampoline.c:1074:34: error: 'FTRACE_HASH_MAX_BITS' undeclared (first use in this function)
    1074 |         hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
         |                                  ^~~~~~~~~~~~~~~~~~~~
   kernel/bpf/trampoline.c:1074:34: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/bpf/trampoline.c:1101:33: error: implicit declaration of function 'ftrace_hash_add_entry' [-Werror=implicit-function-declaration]
    1101 |                                 ftrace_hash_add_entry(hash, entry);
         |                                 ^~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/trampoline.c:1115:15: error: implicit declaration of function 'set_ftrace_direct'; did you mean 'modify_ftrace_direct'? [-Werror=implicit-function-declaration]
    1115 |         err = set_ftrace_direct(hash);
         |               ^~~~~~~~~~~~~~~~~
         |               modify_ftrace_direct
>> kernel/bpf/trampoline.c:1117:9: error: implicit declaration of function 'ftrace_hash_free' [-Werror=implicit-function-declaration]
    1117 |         ftrace_hash_free(hash);
         |         ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/ftrace_hash_alloc +1074 kernel/bpf/trampoline.c

  1067	
  1068	static int bpf_tramp_update_set(struct list_head *upd)
  1069	{
  1070		struct bpf_trampoline *tr;
  1071		struct ftrace_hash *hash;
  1072		int i, err;
  1073	
> 1074		hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
  1075		if (!hash)
  1076			return -ENOMEM;
  1077	
  1078		list_for_each_entry(tr, upd, update.list) {
  1079			struct ftrace_func_entry *entry;
  1080			unsigned long direct;
  1081	
  1082			switch (tr->update.action) {
  1083			case BPF_TRAMP_UPDATE_REG:
  1084			case BPF_TRAMP_UPDATE_MODIFY:
  1085				direct = (unsigned long) tr->update.im->image;
  1086				break;
  1087			case BPF_TRAMP_UPDATE_UNREG:
  1088				direct = 0;
  1089				break;
  1090			}
  1091	
  1092			if (tr->multi.id_multi) {
  1093				for (i = 0; i < tr->multi.id_multi->cnt; i++) {
  1094					entry = kmalloc(sizeof(*entry), GFP_KERNEL);
  1095					if (!entry) {
  1096						err = -ENOMEM;
  1097						goto out_free;
  1098					}
  1099					entry->ip = (unsigned long) tr->multi.id_multi->addr[i];
  1100					entry->direct = direct;
> 1101					ftrace_hash_add_entry(hash, entry);
  1102				}
  1103			} else {
  1104				entry = kmalloc(sizeof(*entry), GFP_KERNEL);
  1105				if (!entry) {
  1106					err = -ENOMEM;
  1107					goto out_free;
  1108				}
  1109				entry->ip = (unsigned long) tr->func.addr;
  1110				entry->direct = direct;
  1111				ftrace_hash_add_entry(hash, entry);
  1112			}
  1113		}
  1114	
  1115		err = set_ftrace_direct(hash);
  1116	out_free:
> 1117		ftrace_hash_free(hash);
  1118		return err;
  1119	}
  1120	

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