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Subject[jolsa-perf:bpf/tramp_29 25/32] kernel/bpf/trampoline.c:948:9: error: call to undeclared function 'ftrace_hash_alloc'; ISO C99 and later do not support implicit function declarations
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tramp_29
head: ec522c20e55e48f561146afbb81513e20870ee12
commit: f8f16c805972e534643c5a5d23709766f7af22e4 [25/32] bpf: Add support to attach multi trampolines
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220712/202207120555.rWXO6yao-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project badda4ac3c489a8c8cccdad1f74b9308c350a9e0)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=f8f16c805972e534643c5a5d23709766f7af22e4
git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
git fetch --no-tags jolsa-perf bpf/tramp_29
git checkout f8f16c805972e534643c5a5d23709766f7af22e4
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> kernel/bpf/trampoline.c:948:9: error: call to undeclared function 'ftrace_hash_alloc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
^
>> kernel/bpf/trampoline.c:948:27: error: use of undeclared identifier 'FTRACE_HASH_MAX_BITS'
hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
^
>> kernel/bpf/trampoline.c:975:5: error: call to undeclared function 'ftrace_hash_add_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
ftrace_hash_add_entry(hash, entry);
^
kernel/bpf/trampoline.c:985:4: error: call to undeclared function 'ftrace_hash_add_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
ftrace_hash_add_entry(hash, entry);
^
>> kernel/bpf/trampoline.c:989:8: error: call to undeclared function 'set_ftrace_direct'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
err = set_ftrace_direct(hash);
^
>> kernel/bpf/trampoline.c:991:2: error: call to undeclared function 'ftrace_hash_free'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
ftrace_hash_free(hash);
^
6 errors generated.


vim +/ftrace_hash_alloc +948 kernel/bpf/trampoline.c

941
942 static int bpf_tramp_update_set(struct list_head *upd)
943 {
944 struct bpf_trampoline *tr;
945 struct ftrace_hash *hash;
946 int i, err;
947
> 948 hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
949 if (!hash)
950 return -ENOMEM;
951
952 list_for_each_entry(tr, upd, update.list) {
953 struct ftrace_func_entry *entry;
954 unsigned long direct;
955
956 switch (tr->update.action) {
957 case BPF_TRAMP_UPDATE_REG:
958 case BPF_TRAMP_UPDATE_MODIFY:
959 direct = (unsigned long) tr->update.im->image;
960 break;
961 case BPF_TRAMP_UPDATE_UNREG:
962 direct = 0;
963 break;
964 }
965
966 if (tr->multi.id_multi) {
967 for (i = 0; i < tr->multi.id_multi->cnt; i++) {
968 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
969 if (!entry) {
970 err = -ENOMEM;
971 goto out_free;
972 }
973 entry->ip = (unsigned long) tr->multi.id_multi->addr[i];
974 entry->direct = direct;
> 975 ftrace_hash_add_entry(hash, entry);
976 }
977 } else {
978 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
979 if (!entry) {
980 err = -ENOMEM;
981 goto out_free;
982 }
983 entry->ip = (unsigned long) tr->func.addr;
984 entry->direct = direct;
985 ftrace_hash_add_entry(hash, entry);
986 }
987 }
988
> 989 err = set_ftrace_direct(hash);
990 out_free:
> 991 ftrace_hash_free(hash);
992 return err;
993 }
994

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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