From: Alexei Starovoitov <a...@fb.com>
Date: Wed, 9 Mar 2016 18:56:49 -0800
> 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: 557c0c6e7df8 ("bpf: convert stackmap to pre-allocation")
> Reported-by: Fengguang Wu <fengguang...@intel.com>
> Signed-off-by: Alexei Starovoitov <a...@kernel.org>
Applied.
