On Fri, Aug 27, 2021 at 11:10:39PM +0800, kernel test robot wrote: > All errors (new ones prefixed by >>): > > riscv32-linux-ld: kernel/bpf/trampoline.o: in function `.L57': > >> trampoline.c:(.text+0x34c): undefined reference to `__SCK__perf_snapshot_branch_stack' > riscv32-linux-ld: kernel/bpf/trampoline.o: in function `.L61': > trampoline.c:(.text+0x360): undefined reference to `bpf_perf_branch_snapshot' > This a build with PERF_EVENTS=n, I suppose you'd better make calling perf_snapshot_branch_stack() dependent on having that :-)
