Re: [PATCH v2 bpf-next 2/3] bpf: introduce helper bpf_get_branch_snapshot
From: Peter Zijlstra <peterz@infradead.org>
Date: 2021-08-30 10:48:59
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lkml, oe-kbuild-all
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':quoted
quoted
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 :-)