Hi "Toke, I love your patch! Yet something to improve: [auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/bpf-Suppo... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from kernel/fork.c:49: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/fork.c:160:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes] 160 | void __weak arch_release_task_struct(struct task_struct *tsk) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/fork.c:743:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes] 743 | void __init __weak arch_task_cache_init(void) { } | ^~~~~~~~~~~~~~~~~~~~ kernel/fork.c:834:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes] 834 | int __weak arch_dup_task_struct(struct task_struct *dst, | ^~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/perf_event.h:57, from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:84, from kernel/exec_domain.c:19: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from kernel/exit.c:41: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/exit.c:1754:13: warning: no previous prototype for 'abort' [-Wmissing-prototypes] 1754 | __weak void abort(void) | ^~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/net/netprio_cgroup.h:11, from include/linux/netdevice.h:42, from include/linux/if_vlan.h:10, from include/linux/filter.h:21, from kernel/kallsyms.c:25: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/kallsyms.c:451:12: warning: no previous prototype for 'arch_get_kallsym' [-Wmissing-prototypes] 451 | int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value, | ^~~~~~~~~~~~~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/perf_event.h:57, from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:84, from kernel/audit.c:44: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/audit.c: In function 'audit_log_vformat': kernel/audit.c:1924:2: warning: function 'audit_log_vformat' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 1924 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); | ^~~ kernel/audit.c:1933:3: warning: function 'audit_log_vformat' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 1933 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); | ^~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/perf_event.h:57, from include/linux/hw_breakpoint.h:5, from kernel/trace/trace.h:15, from kernel/trace/trace_output.h:6, from kernel/trace/ftrace.c:45: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/trace/ftrace.c: In function 'ftrace_ops_get_list_func': kernel/trace/ftrace.c:128:31: warning: cast between incompatible function types from 'void (*)(long unsigned int, long unsigned int)' to 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct pt_regs *)' [-Wcast-function-type] 128 | #define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops) | ^ kernel/trace/ftrace.c:174:10: note: in expansion of macro 'ftrace_ops_list_func' 174 | return ftrace_ops_list_func; | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c: In function 'update_ftrace_function': kernel/trace/ftrace.c:128:31: warning: cast between incompatible function types from 'void (*)(long unsigned int, long unsigned int)' to 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct pt_regs *)' [-Wcast-function-type] 128 | #define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops) | ^ kernel/trace/ftrace.c:207:10: note: in expansion of macro 'ftrace_ops_list_func' 207 | func = ftrace_ops_list_func; | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:128:31: warning: cast between incompatible function types from 'void (*)(long unsigned int, long unsigned int)' to 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct pt_regs *)' [-Wcast-function-type] 128 | #define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops) | ^ kernel/trace/ftrace.c:220:14: note: in expansion of macro 'ftrace_ops_list_func' 220 | if (func == ftrace_ops_list_func) { | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:128:31: warning: cast between incompatible function types from 'void (*)(long unsigned int, long unsigned int)' to 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct pt_regs *)' [-Wcast-function-type] 128 | #define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops) | ^ kernel/trace/ftrace.c:240:26: note: in expansion of macro 'ftrace_ops_list_func' 240 | ftrace_trace_function = ftrace_ops_list_func; | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c: At top level: kernel/trace/ftrace.c:584:5: warning: no previous prototype for 'ftrace_profile_pages_init' [-Wmissing-prototypes] 584 | int ftrace_profile_pages_init(struct ftrace_profile_stat *stat) | ^~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/blk-cgroup.h:17, from include/linux/writeback.h:14, from kernel/trace/trace.c:18: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ In file included from kernel/trace/trace.c:8103: kernel/trace/trace_selftest.c: In function 'trace_selftest_function_regs': kernel/trace/trace_selftest.c:567:6: warning: variable 'len' set but not used [-Wunused-but-set-variable] 567 | int len; | ^~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/perf_event.h:57, from include/linux/hw_breakpoint.h:5, from kernel/trace/trace.h:15, from kernel/trace/trace_output.h:6, from kernel/trace/trace_output.c:14: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/trace/trace_output.c: In function 'trace_output_raw': kernel/trace/trace_output.c:321:2: warning: function 'trace_output_raw' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 321 | trace_seq_vprintf(s, fmt, ap); | ^~~~~~~~~~~~~~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/perf_event.h:57, from include/linux/hw_breakpoint.h:5, from kernel/trace/trace.h:15, from kernel/trace/trace_preemptirq.c:13: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/trace/trace_preemptirq.c:88:16: warning: no previous prototype for 'trace_hardirqs_on_caller' [-Wmissing-prototypes] 88 | __visible void trace_hardirqs_on_caller(unsigned long caller_addr) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_preemptirq.c:103:16: warning: no previous prototype for 'trace_hardirqs_off_caller' [-Wmissing-prototypes] 103 | __visible void trace_hardirqs_off_caller(unsigned long caller_addr) | ^~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/net/netprio_cgroup.h:11, from include/linux/netdevice.h:42, from include/linux/if_vlan.h:10, from include/linux/filter.h:21, from kernel/bpf/core.c:21: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ kernel/bpf/core.c:1353:12: warning: no previous prototype for 'bpf_probe_read_kernel' [-Wmissing-prototypes] 1353 | u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr) | ^~~~~~~~~~~~~~~~~~~~~ In file included from kernel/bpf/core.c:21: kernel/bpf/core.c: In function '___bpf_prog_run': include/linux/filter.h:879:3: warning: cast between incompatible function types from 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} to 'u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, const struct bpf_insn *)'} [-Wcast-function-type] 879 | ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \ | ^ kernel/bpf/core.c:1521:13: note: in expansion of macro '__bpf_call_base_args' 1521 | BPF_R0 = (__bpf_call_base_args + insn->imm)(BPF_R1, BPF_R2, | ^~~~~~~~~~~~~~~~~~~~ kernel/bpf/core.c: In function 'bpf_patch_call_args': include/linux/filter.h:879:3: warning: cast between incompatible function types from 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} to 'u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, const struct bpf_insn *)'} [-Wcast-function-type] 879 | ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \ | ^ kernel/bpf/core.c:1712:3: note: in expansion of macro '__bpf_call_base_args' 1712 | __bpf_call_base_args; | ^~~~~~~~~~~~~~~~~~~~ -- In file included from kernel/bpf/verifier.c:10: 677 | static inline bpf_trampoline *bpf_trampoline_get(u64 key, void *addr, | ^~~~~~~~~~~~~~ In file included from include/linux/bpf_verifier.h:8, from kernel/bpf/verifier.c:12: kernel/bpf/verifier.c: In function 'jit_subprogs': include/linux/filter.h:345:4: warning: cast between incompatible function types from 'unsigned int (*)(const void *, const struct bpf_insn *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10275:16: note: in expansion of macro 'BPF_CAST_CALL' 10275 | insn->imm = BPF_CAST_CALL(func[subprog]->bpf_func) - | ^~~~~~~~~~~~~ kernel/bpf/verifier.c: In function 'fixup_bpf_calls': include/linux/filter.h:345:4: warning: cast between incompatible function types from 'void * (* const)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10650:17: note: in expansion of macro 'BPF_CAST_CALL' 10650 | insn->imm = BPF_CAST_CALL(ops->map_lookup_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:345:4: warning: cast between incompatible function types from 'int (* const)(struct bpf_map *, void *, void *, u64)' {aka 'int (* const)(struct bpf_map *, void *, void *, long long unsigned int)'} to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10654:17: note: in expansion of macro 'BPF_CAST_CALL' 10654 | insn->imm = BPF_CAST_CALL(ops->map_update_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:345:4: warning: cast between incompatible function types from 'int (* const)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10658:17: note: in expansion of macro 'BPF_CAST_CALL' 10658 | insn->imm = BPF_CAST_CALL(ops->map_delete_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:345:4: warning: cast between incompatible function types from 'int (* const)(struct bpf_map *, void *, u64)' {aka 'int (* const)(struct bpf_map *, void *, long long unsigned int)'} to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10662:17: note: in expansion of macro 'BPF_CAST_CALL' 10662 | insn->imm = BPF_CAST_CALL(ops->map_push_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:345:4: warning: cast between incompatible function types from 'int (* const)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10666:17: note: in expansion of macro 'BPF_CAST_CALL' 10666 | insn->imm = BPF_CAST_CALL(ops->map_pop_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:345:4: warning: cast between incompatible function types from 'int (* const)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 345 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:10670:17: note: in expansion of macro 'BPF_CAST_CALL' 10670 | insn->imm = BPF_CAST_CALL(ops->map_peek_elem) - | ^~~~~~~~~~~~~ kernel/bpf/verifier.c: In function 'check_attach_btf_id': 11335 | tr = bpf_trampoline_get(key, (void *)addr, &fmodel); | ^ cc1: some warnings being treated as errors .. # https://github.com/0day-ci/linux/commit/a8ac936b7bd5e7363a8a335bc657635f4... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Toke-H-iland-J-rgensen/bpf-Support-multi-attach-for-freplace-programs/20200915-003428 git checkout a8ac936b7bd5e7363a8a335bc657635f4cf0fe24 vim +/bpf_trampoline +677 include/linux/bpf.h 634 635 #define DEFINE_BPF_DISPATCHER(name) \ 636 noinline unsigned int bpf_dispatcher_##name##_func( \ 637 const void *ctx, \ 638 const struct bpf_insn *insnsi, \ 639 unsigned int (*bpf_func)(const void *, \ 640 const struct bpf_insn *)) \ 641 { \ 642 return bpf_func(ctx, insnsi); \ 643 } \ 644 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \ 645 struct bpf_dispatcher bpf_dispatcher_##name = \ 646 BPF_DISPATCHER_INIT(bpf_dispatcher_##name); 647 #define DECLARE_BPF_DISPATCHER(name) \ 648 unsigned int bpf_dispatcher_##name##_func( \ 649 const void *ctx, \ 650 const struct bpf_insn *insnsi, \ 651 unsigned int (*bpf_func)(const void *, \ 652 const struct bpf_insn *)); \ 653 extern struct bpf_dispatcher bpf_dispatcher_##name; 654 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func 655 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name) 656 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 657 struct bpf_prog *to); 658 /* Called only from JIT-enabled code, so there's no need for stubs. */ 659 void *bpf_jit_alloc_exec_page(void); 660 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym); 661 void bpf_image_ksym_del(struct bpf_ksym *ksym); 662 void bpf_ksym_add(struct bpf_ksym *ksym); 663 void bpf_ksym_del(struct bpf_ksym *ksym); 664 #else 665 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key) 666 { 667 return NULL; 668 } 669 static inline int bpf_trampoline_link_prog(struct bpf_prog *prog) 670 { 671 return -ENOTSUPP; 672 } 673 static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog) 674 { 675 return -ENOTSUPP; 676 } 678 struct btf_func_model *fmodel) 679 { 680 return ERR_PTR(-EOPNOTSUPP); 681 } 682 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {} 683 #define DEFINE_BPF_DISPATCHER(name) 684 #define DECLARE_BPF_DISPATCHER(name) 685 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func 686 #define BPF_DISPATCHER_PTR(name) NULL 687 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, 688 struct bpf_prog *from, 689 struct bpf_prog *to) {} 690 static inline bool is_bpf_image_address(unsigned long address) 691 { 692 return false; 693 } 694 #endif 695 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org