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| author |   Yonghong Song <yhs@fb.com> | 2017-12-13 10:35:37 -0800 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2017-12-13 22:44:10 +0100 |
| commit | f4e2298e63d24bb7f5cf0f56f72867973cb7e652 (patch) | |
| tree | fd3dc43e1d9c9c9b14784fd0c3639e2cac7cea04 /include/linux/trace_events.h | |
| parent | Merge branch 'bpf-override-return' (diff) | |
| download | linux-dev-f4e2298e63d24bb7f5cf0f56f72867973cb7e652.tar.xz linux-dev-f4e2298e63d24bb7f5cf0f56f72867973cb7e652.zip | |
bpf/tracing: fix kernel/events/core.c compilation error
Commit f371b304f12e ("bpf/tracing: allow user space to
query prog array on the same tp") introduced a perf
ioctl command to query prog array attached to the
same perf tracepoint. The commit introduced a
compilation error under certain config conditions, e.g.,
(1). CONFIG_BPF_SYSCALL is not defined, or
(2). CONFIG_TRACING is defined but neither CONFIG_UPROBE_EVENTS
nor CONFIG_KPROBE_EVENTS is defined.
Error message:
kernel/events/core.o: In function `perf_ioctl':
core.c:(.text+0x98c4): undefined reference to `bpf_event_query_prog_array'
This patch fixed this error by guarding the real definition under
CONFIG_BPF_EVENTS and provided static inline dummy function
if CONFIG_BPF_EVENTS was not defined.
It renamed the function from bpf_event_query_prog_array to
perf_event_query_prog_array and moved the definition from linux/bpf.h
to linux/trace_events.h so the definition is in proximity to
other prog_array related functions.
Fixes: f371b304f12e ("bpf/tracing: allow user space to query prog array on the same tp")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/linux/trace_events.h')
| -rw-r--r-- | include/linux/trace_events.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index 5fea451f6e28..8a1442c4e513 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -467,6 +467,7 @@ trace_trigger_soft_disabled(struct trace_event_file *file) unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx); int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog); void perf_event_detach_bpf_prog(struct perf_event *event); +int perf_event_query_prog_array(struct perf_event *event, void __user *info); #else static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx) { @@ -481,6 +482,11 @@ perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog) static inline void perf_event_detach_bpf_prog(struct perf_event *event) { } +static inline int +perf_event_query_prog_array(struct perf_event *event, void __user *info) +{ + return -EOPNOTSUPP; +} #endif enum { |