[jolsa-perf:bpf/batch 10/29] kernel/bpf/syscall.c:2769:8: error: implicit declaration of function 'bpf_tramp_id_alloc'

From: kernel test robot
Date: Thu Nov 18 2021 - 09:35:37 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/batch
head: 5f1f613266bf58f8424a93e1f8b99c4ac8fa6c2b
commit: cbe393beb391564c3571b19dc56e28873904f48e [10/29] bpf: Add bpf_trampoline_id object
config: hexagon-randconfig-r035-20211118 (attached as .config)
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=cbe393beb391564c3571b19dc56e28873904f48e
git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
git fetch --no-tags jolsa-perf bpf/batch
git checkout cbe393beb391564c3571b19dc56e28873904f48e
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

>> kernel/bpf/syscall.c:2769:8: error: implicit declaration of function 'bpf_tramp_id_alloc' [-Werror,-Wimplicit-function-declaration]
id = bpf_tramp_id_alloc();
^
kernel/bpf/syscall.c:2769:8: note: did you mean 'bpf_map_kzalloc'?
kernel/bpf/syscall.c:425:7: note: 'bpf_map_kzalloc' declared here
void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
^
>> kernel/bpf/syscall.c:2769:6: warning: incompatible integer to pointer conversion assigning to 'struct bpf_tramp_id *' from 'int' [-Wint-conversion]
id = bpf_tramp_id_alloc();
^ ~~~~~~~~~~~~~~~~~~~~
kernel/bpf/syscall.c:2782:3: error: implicit declaration of function 'bpf_tramp_id_init' [-Werror,-Wimplicit-function-declaration]
bpf_tramp_id_init(id, tgt_prog, NULL, btf_id);
^
kernel/bpf/syscall.c:2782:3: note: did you mean 'bpf_tramp_id_alloc'?
kernel/bpf/syscall.c:2769:8: note: 'bpf_tramp_id_alloc' declared here
id = bpf_tramp_id_alloc();
^
kernel/bpf/syscall.c:2832:8: error: implicit declaration of function 'bpf_tramp_id_alloc' [-Werror,-Wimplicit-function-declaration]
id = bpf_tramp_id_alloc();
^
kernel/bpf/syscall.c:2832:6: warning: incompatible integer to pointer conversion assigning to 'struct bpf_tramp_id *' from 'int' [-Wint-conversion]
id = bpf_tramp_id_alloc();
^ ~~~~~~~~~~~~~~~~~~~~
kernel/bpf/syscall.c:2839:3: error: implicit declaration of function 'bpf_tramp_id_init' [-Werror,-Wimplicit-function-declaration]
bpf_tramp_id_init(id, NULL, prog->aux->attach_btf, btf_id);
^
>> kernel/bpf/syscall.c:2843:8: error: implicit declaration of function 'bpf_tramp_id_is_empty' [-Werror,-Wimplicit-function-declaration]
(!bpf_tramp_id_is_empty(id) &&
^
>> kernel/bpf/syscall.c:2844:8: error: implicit declaration of function 'bpf_tramp_id_is_equal' [-Werror,-Wimplicit-function-declaration]
bpf_tramp_id_is_equal(id, prog->aux->dst_trampoline->id))) {
^
kernel/bpf/syscall.c:2844:8: note: did you mean 'bpf_tramp_id_is_empty'?
kernel/bpf/syscall.c:2843:8: note: 'bpf_tramp_id_is_empty' declared here
(!bpf_tramp_id_is_empty(id) &&
^
kernel/bpf/syscall.c:2916:2: error: implicit declaration of function 'bpf_tramp_id_free' [-Werror,-Wimplicit-function-declaration]
bpf_tramp_id_free(id);
^
2 warnings and 7 errors generated.
--
kernel/bpf/verifier.c:13998:7: error: implicit declaration of function 'bpf_tramp_id_alloc' [-Werror,-Wimplicit-function-declaration]
id = bpf_tramp_id_alloc();
^
kernel/bpf/verifier.c:13998:7: note: did you mean 'bpf_map_kzalloc'?
include/linux/bpf.h:1457:7: note: 'bpf_map_kzalloc' declared here
void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
^
>> kernel/bpf/verifier.c:13998:5: warning: incompatible integer to pointer conversion assigning to 'struct bpf_tramp_id *' from 'int' [-Wint-conversion]
id = bpf_tramp_id_alloc();
^ ~~~~~~~~~~~~~~~~~~~~
kernel/bpf/verifier.c:14002:2: error: implicit declaration of function 'bpf_tramp_id_init' [-Werror,-Wimplicit-function-declaration]
bpf_tramp_id_init(id, tgt_prog, prog->aux->attach_btf, btf_id);
^
kernel/bpf/verifier.c:14002:2: note: did you mean 'bpf_tramp_id_alloc'?
kernel/bpf/verifier.c:13998:7: note: 'bpf_tramp_id_alloc' declared here
id = bpf_tramp_id_alloc();
^
kernel/bpf/verifier.c:14005:3: error: implicit declaration of function 'bpf_tramp_id_free' [-Werror,-Wimplicit-function-declaration]
bpf_tramp_id_free(id);
^
kernel/bpf/verifier.c:14005:3: note: did you mean 'bpf_tramp_id_init'?
kernel/bpf/verifier.c:14002:2: note: 'bpf_tramp_id_init' declared here
bpf_tramp_id_init(id, tgt_prog, prog->aux->attach_btf, btf_id);
^
1 warning and 3 errors generated.

vim +/bpf_tramp_id_alloc +2769 kernel/bpf/syscall.c

2718
2719 static int bpf_tracing_prog_attach(struct bpf_prog *prog,
2720 int tgt_prog_fd,
2721 u32 btf_id)
2722 {
2723 bool prog_extension = prog->type == BPF_PROG_TYPE_EXT;
2724 struct bpf_link_primer link_primer;
2725 struct bpf_prog *tgt_prog = NULL;
2726 struct bpf_trampoline *tr = NULL;
2727 struct bpf_tracing_link *link;
2728 struct bpf_tramp_id *id = NULL;
2729 int err;
2730
2731 switch (prog->type) {
2732 case BPF_PROG_TYPE_TRACING:
2733 if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
2734 prog->expected_attach_type != BPF_TRACE_FEXIT &&
2735 prog->expected_attach_type != BPF_MODIFY_RETURN) {
2736 err = -EINVAL;
2737 goto out_put_prog;
2738 }
2739 break;
2740 case BPF_PROG_TYPE_EXT:
2741 if (prog->expected_attach_type != 0) {
2742 err = -EINVAL;
2743 goto out_put_prog;
2744 }
2745 break;
2746 case BPF_PROG_TYPE_LSM:
2747 if (prog->expected_attach_type != BPF_LSM_MAC) {
2748 err = -EINVAL;
2749 goto out_put_prog;
2750 }
2751 break;
2752 default:
2753 err = -EINVAL;
2754 goto out_put_prog;
2755 }
2756
2757 if (!!tgt_prog_fd != !!btf_id) {
2758 err = -EINVAL;
2759 goto out_put_prog;
2760 }
2761
2762 if (tgt_prog_fd) {
2763 /* For now we only allow new targets for BPF_PROG_TYPE_EXT */
2764 if (prog->type != BPF_PROG_TYPE_EXT) {
2765 err = -EINVAL;
2766 goto out_put_prog;
2767 }
2768
> 2769 id = bpf_tramp_id_alloc();
2770 if (!id) {
2771 err = -ENOMEM;
2772 goto out_put_prog;
2773 }
2774
2775 tgt_prog = bpf_prog_get(tgt_prog_fd);
2776 if (IS_ERR(tgt_prog)) {
2777 err = PTR_ERR(tgt_prog);
2778 tgt_prog = NULL;
2779 goto out_put_prog;
2780 }
2781
2782 bpf_tramp_id_init(id, tgt_prog, NULL, btf_id);
2783 }
2784
2785 link = kzalloc(sizeof(*link), GFP_USER);
2786 if (!link) {
2787 err = -ENOMEM;
2788 goto out_put_prog;
2789 }
2790 bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING,
2791 &bpf_tracing_link_lops, prog);
2792 link->attach_type = prog->expected_attach_type;
2793
2794 mutex_lock(&prog->aux->dst_mutex);
2795
2796 if (!prog_extension && prog->aux->trampoline) {
2797 err = -EBUSY;
2798 goto out_unlock;
2799 }
2800
2801 /* There are a few possible cases here:
2802 *
2803 * - if prog->aux->dst_trampoline is set, the program was just loaded
2804 * and not yet attached to anything, so we can use the values stored
2805 * in prog->aux
2806 *
2807 * - if prog->aux->dst_trampoline is NULL, the program has already been
2808 * attached to a target and its initial target was cleared (below)
2809 *
2810 * - if tgt_prog != NULL, the caller specified tgt_prog_fd +
2811 * target_btf_id using the link_create API.
2812 *
2813 * - if tgt_prog == NULL when this function was called using the old
2814 * raw_tracepoint_open API, and we need a target from prog->aux
2815 *
2816 * - if prog->aux->dst_trampoline and tgt_prog is NULL, the program
2817 * was detached and is going for re-attachment.
2818 */
2819 if (!prog->aux->dst_trampoline && !tgt_prog) {
2820 /*
2821 * Allow re-attach for TRACING and LSM programs. If it's
2822 * currently linked, bpf_trampoline_link_prog will fail.
2823 * EXT programs need to specify tgt_prog_fd, so they
2824 * re-attach in separate code path.
2825 */
2826 if (prog->type != BPF_PROG_TYPE_TRACING &&
2827 prog->type != BPF_PROG_TYPE_LSM) {
2828 err = -EINVAL;
2829 goto out_unlock;
2830 }
2831
2832 id = bpf_tramp_id_alloc();
2833 if (!id) {
2834 err = -ENOMEM;
2835 goto out_unlock;
2836 }
2837
2838 btf_id = prog->aux->attach_btf_id;
2839 bpf_tramp_id_init(id, NULL, prog->aux->attach_btf, btf_id);
2840 }
2841
2842 if (!prog->aux->dst_trampoline ||
> 2843 (!bpf_tramp_id_is_empty(id) &&
> 2844 bpf_tramp_id_is_equal(id, prog->aux->dst_trampoline->id))) {
2845 /* If there is no saved target, or the specified target is
2846 * different from the destination specified at load time, we
2847 * need a new trampoline and a check for compatibility
2848 */
2849 struct bpf_attach_target_info tgt_info = {};
2850
2851 err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
2852 &tgt_info);
2853 if (err)
2854 goto out_unlock;
2855
2856 tr = bpf_trampoline_get(id, &tgt_info);
2857 if (!tr) {
2858 err = -ENOMEM;
2859 goto out_unlock;
2860 }
2861 } else {
2862 /* The caller didn't specify a target, or the target was the
2863 * same as the destination supplied during program load. This
2864 * means we can reuse the trampoline and reference from program
2865 * load time, and there is no need to allocate a new one. This
2866 * can only happen once for any program, as the saved values in
2867 * prog->aux are cleared below.
2868 */
2869 tr = prog->aux->dst_trampoline;
2870 tgt_prog = prog->aux->dst_prog;
2871 }
2872
2873 err = bpf_link_prime(&link->link, &link_primer);
2874 if (err)
2875 goto out_unlock;
2876
2877 err = bpf_trampoline_link_prog(prog, tr);
2878 if (err) {
2879 bpf_link_cleanup(&link_primer);
2880 link = NULL;
2881 goto out_unlock;
2882 }
2883
2884 link->tgt_prog = tgt_prog;
2885
2886 if (prog_extension)
2887 link->trampoline = tr;
2888 else
2889 prog->aux->trampoline = tr;
2890
2891 /* Always clear the trampoline and target prog from prog->aux to make
2892 * sure the original attach destination is not kept alive after a
2893 * program is (re-)attached to another target.
2894 */
2895 if (prog->aux->dst_prog &&
2896 (tgt_prog_fd || tr != prog->aux->dst_trampoline))
2897 /* got extra prog ref from syscall, or attaching to different prog */
2898 bpf_prog_put(prog->aux->dst_prog);
2899 if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
2900 /* we allocated a new trampoline, so free the old one */
2901 bpf_trampoline_put(prog->aux->dst_trampoline);
2902
2903 prog->aux->dst_prog = NULL;
2904 prog->aux->dst_trampoline = NULL;
2905 mutex_unlock(&prog->aux->dst_mutex);
2906
2907 return bpf_link_settle(&link_primer);
2908 out_unlock:
2909 if (tr && tr != prog->aux->dst_trampoline)
2910 bpf_trampoline_put(tr);
2911 mutex_unlock(&prog->aux->dst_mutex);
2912 kfree(link);
2913 out_put_prog:
2914 if (tgt_prog_fd && tgt_prog)
2915 bpf_prog_put(tgt_prog);
2916 bpf_tramp_id_free(id);
2917 return err;
2918 }
2919

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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Next message: Sebastian Andrzej Siewior: "[PATCH 8/8] kernel/fork: Use IS_ENABLED() in account_kernel_stack()."
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