[jolsa-perf:bpf/tracing_multi_4 24/34] kernel/bpf/syscall.c:3328:12: warning: assignment to 'struct bpf_tramp_id *' from 'int' makes pointer from integer without a cast
From: kernel test robot
Date: Thu Jul 28 2022 - 09:19:25 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tracing_multi_4
head: 1637b6b5bec11596e52cdc0a6eadfa45a15276c3
commit: ddb4a6defabce7658e7c6be7397bd5e714279b48 [24/34] bpf: Add support for tracing multi link
config: x86_64-randconfig-a013 (https://download.01.org/0day-ci/archive/20220728/202207282122.eP6T0wNr-lkp@xxxxxxxxx/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=ddb4a6defabce7658e7c6be7397bd5e714279b48
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 ddb4a6defabce7658e7c6be7397bd5e714279b48
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/bpf/
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
kernel/bpf/syscall.c: In function 'bpf_prog_load':
kernel/bpf/syscall.c:2523:22: error: implicit declaration of function 'is_tracing_multi' [-Werror=implicit-function-declaration]
2523 | multi_func = is_tracing_multi(attr->expected_attach_type);
| ^~~~~~~~~~~~~~~~
In file included from arch/x86/include/asm/bug.h:87,
from include/linux/bug.h:5,
from include/linux/cpumask.h:14,
from arch/x86/include/asm/cpumask.h:5,
from arch/x86/include/asm/msr.h:11,
from arch/x86/include/asm/processor.h:22,
from arch/x86/include/asm/timex.h:5,
from include/linux/timex.h:67,
from include/linux/time32.h:13,
from include/linux/time.h:60,
from include/linux/ktime.h:24,
from include/linux/timer.h:6,
from include/linux/workqueue.h:9,
from include/linux/bpf.h:10,
from kernel/bpf/syscall.c:4:
kernel/bpf/syscall.c: In function 'bpf_tracing_multi_link_release':
kernel/bpf/syscall.c:3157:22: error: implicit declaration of function 'bpf_trampoline_multi_detach' [-Werror=implicit-function-declaration]
3157 | WARN_ON_ONCE(bpf_trampoline_multi_detach(&tr_link->tp, tr_link->id));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/bug.h:110:32: note: in definition of macro 'WARN_ON_ONCE'
110 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
kernel/bpf/syscall.c: In function 'bpf_tracing_multi_link_dealloc':
kernel/bpf/syscall.c:3165:9: error: implicit declaration of function 'bpf_tramp_id_put'; did you mean 'bpf_trampoline_put'? [-Werror=implicit-function-declaration]
3165 | bpf_tramp_id_put(tr_link->id);
| ^~~~~~~~~~~~~~~~
| bpf_trampoline_put
kernel/bpf/syscall.c: In function 'bpf_tracing_multi_attach':
kernel/bpf/syscall.c:3328:14: error: implicit declaration of function 'bpf_tramp_id_alloc'; did you mean 'bpf_tramp_id_resolve'? [-Werror=implicit-function-declaration]
3328 | id = bpf_tramp_id_alloc(cnt);
| ^~~~~~~~~~~~~~~~~~
| bpf_tramp_id_resolve
>> kernel/bpf/syscall.c:3328:12: warning: assignment to 'struct bpf_tramp_id *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
3328 | id = bpf_tramp_id_alloc(cnt);
| ^
kernel/bpf/syscall.c:3369:15: error: implicit declaration of function 'bpf_trampoline_multi_attach'; did you mean 'bpf_tracing_multi_attach'? [-Werror=implicit-function-declaration]
3369 | err = bpf_trampoline_multi_attach(&link->tp, id);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
| bpf_tracing_multi_attach
cc1: some warnings being treated as errors
vim +3328 kernel/bpf/syscall.c
3312
3313 static int bpf_tracing_multi_attach(struct bpf_prog *prog,
3314 const union bpf_attr *attr)
3315 {
3316 void __user *uids = u64_to_user_ptr(attr->link_create.tracing_multi.btf_ids);
3317 u32 cnt_size, cnt = attr->link_create.tracing_multi.btf_ids_cnt;
3318 struct bpf_tracing_multi_link *link = NULL;
3319 struct bpf_link_primer link_primer;
3320 struct bpf_tramp_id *id = NULL;
3321 int err = -EINVAL;
3322
3323 if (check_multi_prog_type(prog))
3324 return -EINVAL;
3325 if (!cnt || !uids)
3326 return -EINVAL;
3327
> 3328 id = bpf_tramp_id_alloc(cnt);
3329 if (!id)
3330 return -ENOMEM;
3331
3332 err = -EFAULT;
3333 cnt_size = cnt * sizeof(id->id[0]);
3334 if (copy_from_user(id->id, uids, cnt_size))
3335 goto out_free_id;
3336
3337 id->cnt = cnt;
3338 id->obj_id = btf_obj_id(prog->aux->attach_btf);
3339
3340 /* Sort user provided BTF ids, so we can use memcmp
3341 * and bsearch on top of it later.
3342 */
3343 sort(id->id, cnt, sizeof(u32), btf_ids_cmp, NULL);
3344
3345 err = bpf_tramp_id_resolve(id, prog);
3346 if (err)
3347 goto out_free_id;
3348
3349 link = kzalloc(sizeof(*link), GFP_KERNEL);
3350 if (!link) {
3351 err = -ENOMEM;
3352 goto out_free_id;
3353 }
3354
3355 bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING_MULTI,
3356 &bpf_tracing_multi_link_lops, prog);
3357 link->attach_type = prog->expected_attach_type;
3358
3359 err = bpf_link_prime(&link->link, &link_primer);
3360 if (err) {
3361 kfree(link);
3362 goto out_free_id;
3363 }
3364
3365 link->id = id;
3366 link->tp.cookie = 0;
3367 link->tp.prog = prog;
3368
3369 err = bpf_trampoline_multi_attach(&link->tp, id);
3370 if (err) {
3371 bpf_link_cleanup(&link_primer);
3372 goto out_free_id;
3373 }
3374 return bpf_link_settle(&link_primer);
3375 out_free_id:
3376 kfree(id);
3377 return err;
3378 }
3379
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