Hi Kumar, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Kumar-Kartikeya-Dwivedi/Fixes-for-bad-PTR_TO_BTF_ID-offset/20220301-150010 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: s390-randconfig-r021-20220301 (https://download.01.org/0day-ci/archive/20220301/202203011937.wMLpkfU3-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e) 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 # install s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://github.com/0day-ci/linux/commit/37a0d686bce3b71b14a17ae57364ec45d1405b9e git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kumar-Kartikeya-Dwivedi/Fixes-for-bad-PTR_TO_BTF_ID-offset/20220301-150010 git checkout 37a0d686bce3b71b14a17ae57364ec45d1405b9e # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash net/bpf/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ net/bpf/test_run.c:201:14: warning: no previous prototype for function 'bpf_fentry_test1' [-Wmissing-prototypes] int noinline bpf_fentry_test1(int a) ^ net/bpf/test_run.c:201:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test1(int a) ^ static net/bpf/test_run.c:208:14: warning: no previous prototype for function 'bpf_fentry_test2' [-Wmissing-prototypes] int noinline bpf_fentry_test2(int a, u64 b) ^ net/bpf/test_run.c:208:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test2(int a, u64 b) ^ static net/bpf/test_run.c:213:14: warning: no previous prototype for function 'bpf_fentry_test3' [-Wmissing-prototypes] int noinline bpf_fentry_test3(char a, int b, u64 c) ^ net/bpf/test_run.c:213:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test3(char a, int b, u64 c) ^ static net/bpf/test_run.c:218:14: warning: no previous prototype for function 'bpf_fentry_test4' [-Wmissing-prototypes] int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) ^ net/bpf/test_run.c:218:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) ^ static net/bpf/test_run.c:223:14: warning: no previous prototype for function 'bpf_fentry_test5' [-Wmissing-prototypes] int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) ^ net/bpf/test_run.c:223:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) ^ static net/bpf/test_run.c:228:14: warning: no previous prototype for function 'bpf_fentry_test6' [-Wmissing-prototypes] int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) ^ net/bpf/test_run.c:228:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) ^ static net/bpf/test_run.c:237:14: warning: no previous prototype for function 'bpf_fentry_test7' [-Wmissing-prototypes] int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) ^ net/bpf/test_run.c:237:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) ^ static net/bpf/test_run.c:242:14: warning: no previous prototype for function 'bpf_fentry_test8' [-Wmissing-prototypes] int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) ^ net/bpf/test_run.c:242:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) ^ static net/bpf/test_run.c:247:14: warning: no previous prototype for function 'bpf_modify_return_test' [-Wmissing-prototypes] int noinline bpf_modify_return_test(int a, int *b) ^ net/bpf/test_run.c:247:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_modify_return_test(int a, int *b) ^ static net/bpf/test_run.c:253:14: warning: no previous prototype for function 'bpf_kfunc_call_test1' [-Wmissing-prototypes] u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) ^ net/bpf/test_run.c:253:1: note: declare 'static' if the function is not intended to be used outside of this translation unit u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) ^ static net/bpf/test_run.c:258:14: warning: no previous prototype for function 'bpf_kfunc_call_test2' [-Wmissing-prototypes] int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) ^ net/bpf/test_run.c:258:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) ^ static net/bpf/test_run.c:263:24: warning: no previous prototype for function 'bpf_kfunc_call_test3' [-Wmissing-prototypes] struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) ^ net/bpf/test_run.c:263:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) ^ static net/bpf/test_run.c:286:1: warning: no previous prototype for function 'bpf_kfunc_call_test_acquire' [-Wmissing-prototypes] bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr) ^ net/bpf/test_run.c:285:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline struct prog_test_ref_kfunc * ^ static net/bpf/test_run.c:294:15: warning: no previous prototype for function 'bpf_kfunc_call_test_release' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) ^ net/bpf/test_run.c:294:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) ^ static >> net/bpf/test_run.c:298:15: warning: no previous prototype for function 'bpf_kfunc_call_memb_release' [-Wmissing-prototypes] noinline void bpf_kfunc_call_memb_release(struct prog_test_member *p) ^ net/bpf/test_run.c:298:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_memb_release(struct prog_test_member *p) ^ static net/bpf/test_run.c:340:15: warning: no previous prototype for function 'bpf_kfunc_call_test_pass_ctx' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb) ^ net/bpf/test_run.c:340:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb) ^ static net/bpf/test_run.c:344:15: warning: no previous prototype for function 'bpf_kfunc_call_test_pass1' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p) ^ net/bpf/test_run.c:344:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p) ^ static net/bpf/test_run.c:348:15: warning: no previous prototype for function 'bpf_kfunc_call_test_pass2' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) ^ net/bpf/test_run.c:348:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) ^ static net/bpf/test_run.c:352:15: warning: no previous prototype for function 'bpf_kfunc_call_test_fail1' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p) ^ net/bpf/test_run.c:352:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p) ^ static net/bpf/test_run.c:356:15: warning: no previous prototype for function 'bpf_kfunc_call_test_fail2' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p) ^ net/bpf/test_run.c:356:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p) ^ static net/bpf/test_run.c:360:15: warning: no previous prototype for function 'bpf_kfunc_call_test_fail3' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p) ^ net/bpf/test_run.c:360:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p) ^ static net/bpf/test_run.c:364:15: warning: no previous prototype for function 'bpf_kfunc_call_test_mem_len_pass1' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_mem_len_pass1(void *mem, int mem__sz) ^ net/bpf/test_run.c:364:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_mem_len_pass1(void *mem, int mem__sz) ^ static net/bpf/test_run.c:368:15: warning: no previous prototype for function 'bpf_kfunc_call_test_mem_len_fail1' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len) ^ net/bpf/test_run.c:368:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len) ^ static net/bpf/test_run.c:372:15: warning: no previous prototype for function 'bpf_kfunc_call_test_mem_len_fail2' [-Wmissing-prototypes] noinline void bpf_kfunc_call_test_mem_len_fail2(u64 *mem, int len) ^ net/bpf/test_run.c:372:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline void bpf_kfunc_call_test_mem_len_fail2(u64 *mem, int len) ^ static 36 warnings generated. vim +/bpf_kfunc_call_memb_release +298 net/bpf/test_run.c 297 > 298 noinline void bpf_kfunc_call_memb_release(struct prog_test_member *p) 299 { 300 } 301 --- 0-DAY CI Kernel Test Service, Intel Corporation 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