diff options
| author | Alexei Starovoitov <ast@fb.com> | 2016-03-09 18:56:49 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-03-09 23:26:51 -0500 |
| commit | b8cdc05173f05d212627b7aba7ec47fa334a79f2 (patch) | |
| tree | 0f22256fd7e864e2770e2b7c6f7ee494457ac11c | |
| parent | 3b8377dca1fd1974d245b2a04a708fc434761c65 (diff) | |
bpf: bpf_stackmap_copy depends on CONFIG_PERF_EVENTS
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | kernel/bpf/syscall.c | 5 |
1 files changed, 5 insertions, 0 deletions
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 |