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I’m seeing a CLANG-BPF build failure in tools/testing/selftests/bpf related to conflicting prototypes of bpf_arena_* helpers between vmlinux.h and bpf_arena_common.h, on mainline kernel. Error log:   In file included from progs/arena_strsearch.c:12:   In file included from tools/testing/selftests/bpf/bpf_arena_strsearch.h:4:   tools/testing/selftests/bpf/bpf_arena_common.h:47:15:     error: conflicting types for 'bpf_arena_alloc_pages'       void __arena* bpf_arena_alloc_pages(void *map,                                           void __arena *addr,                                           __u32 page_cnt,                                           __u32 node_id,                                           __u64 flags);   tools/testing/selftests/bpf/tools/include/vmlinux.h:135295:14:     note: previous declaration is here       extern void *bpf_arena_alloc_pages(void *p__map,                                          void *addr__ign,                                          u32 page_cnt,                                          int node_id,                                          u64 flags) __weak __ksym;   tools/testing/selftests/bpf/bpf_arena_common.h:49:5:     error: conflicting types for 'bpf_arena_reserve_pages'       int bpf_arena_reserve_pages(void *map,                                   void __arena *addr,                                   __u32 page_cnt) __ksym __weak;   tools/testing/selftests/bpf/tools/include/vmlinux.h:135297:12:     note: previous declaration is here       extern int bpf_arena_reserve_pages(void *p__map,                                          void *ptr__ign,                                          u32 page_cnt) __weak __ksym;   tools/testing/selftests/bpf/bpf_arena_common.h:50:6:     error: conflicting types for 'bpf_arena_free_pages'       void bpf_arena_free_pages(void *map,                                 void __arena *ptr,                                 __u32 page_cnt) __ksym __weak;   tools/testing/selftests/bpf/tools/include/vmlinux.h:135296:13:     note: previous declaration is here       extern void bpf_arena_free_pages(void *p__map,                                        void *ptr__ign,                                        u32 page_cnt) __weak __ksym; Tool chain Versions: gcc (GCC) 14.2.0 # clang --version clang version 23.0.0git (https://github.com/llvm/llvm-project.git bd6bfba3e50343c112a04b639394ab85be17c29b) # llc --version LLVM (http://llvm.org/):   LLVM version 23.0.0git   Optimized build.   Default target: powerpc64le-unknown-linux-gnu   Host CPU: (unknown)   Registered Targets:     bpf     - BPF (host endian)     bpfeb   - BPF (big endian)     bpfel   - BPF (little endian)     ppc32   - PowerPC 32     ppc32le - PowerPC 32 LE     ppc64   - PowerPC 64     ppc64le - PowerPC 64 LE # objcopy --version | head -1 GNU objcopy version 2.35.2-67.el9_7.1 # ld --version | head -1 GNU ld version 2.35.2-67.el9_7.1 If you happen to fix this, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.