The newly added bpf_overflow_handler function is only built of both
CONFIG_EVENT_TRACING and CONFIG_BPF_SYSCALL are enabled, but the caller
only checks the latter:
kernel/events/core.c: In function 'perf_event_alloc':
kernel/events/core.c:9106:27: error: 'bpf_overflow_handler' undeclared (first
use in this function)
This changes the caller so we also skip this call if CONFIG_EVENT_TRACING
is disabled entirely.
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Fixes: aa6a5f3cb2b2 ("perf, bpf: add perf events core support for
BPF_PROG_TYPE_PERF_EVENT programs")
---
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
I'm not entirely sure if this is the correct solution, please check before
applying
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 73d0c6ddfd5b..d3f6374326d8 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9110,7 +9110,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
if (!overflow_handler && parent_event) {
overflow_handler = parent_event->overflow_handler;
context = parent_event->overflow_handler_context;
-#ifdef CONFIG_BPF_SYSCALL
+#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_EVENT_TRACING)
if (overflow_handler == bpf_overflow_handler) {
struct bpf_prog *prog =
bpf_prog_inc(parent_event->prog);
--
2.9.0
