Message ID | 1457578609-277357-1-git-send-email-ast@fb.com |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
From: Alexei Starovoitov <ast@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.wu@intel.com> > Signed-off-by: Alexei Starovoitov <ast@kernel.org> Applied.
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 2978d0d08869..2a2efe1bc76c 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -244,6 +244,11 @@ static void __user *u64_to_ptr(__u64 val) return (void __user *) (unsigned long) val; } +int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) +{ + return -ENOTSUPP; +} + /* last field in 'union bpf_attr' used by this command */ #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value