bpf: bpf_stackmap_copy depends on CONFIG_PERF_EVENTS

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0-day bot reported build error:
kernel/built-in.o: In function `map_lookup_elem':
>> kernel/bpf/.tmp_syscall.o:(.text+0x329b3c): undefined reference to `bpf_stackmap_copy'
when CONFIG_BPF_SYSCALL is set and CONFIG_PERF_EVENTS is not.
Add weak definition to resolve it.
This code path in map_lookup_elem() is never taken
when CONFIG_PERF_EVENTS is not set.

Fixes: 557c0c6e7d ("bpf: convert stackmap to pre-allocation")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Alexei Starovoitov 2016-03-09 18:56:49 -08:00 • committed by David S. Miller

parent 3b8377dca1

commit b8cdc05173

1 changed files with 5 additions and 0 deletions

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kernel/bpf/syscall.c

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