bpf, lsm: Make BPF_LSM depend on BPF_EVENTS

LSM and tracing programs share their helpers with bpf_tracing_func_proto
which is only defined (in bpf_trace.c) when BPF_EVENTS is enabled.

Instead of adding __weak symbol, make BPF_LSM depend on BPF_EVENTS so
that both tracing and LSM programs can actually share helpers.

Fixes: fc611f4 ("bpf: Introduce BPF_PROG_TYPE_LSM")
Reported-by: Randy Dunlap <[email protected]>
Signed-off-by: KP Singh <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: sinkap

init/Kconfig

@@ -1619,6 +1619,7 @@ config KALLSYMS_BASE_RELATIVE
 
 config BPF_LSM
 	bool "LSM Instrumentation with BPF"
+	depends on BPF_EVENTS
 	depends on BPF_SYSCALL
 	depends on SECURITY
 	depends on BPF_JIT