bcc: Allow KFUNC_PROBE to instrument function without arguments

Update KFUNC_PROBE and its family to allow instrument kernel function without specifying arguments. Sometimes, we don't need to bookkeep arguments at function entry, just store a timestamp. This fix would allow this use case. Signed-off-by: Hengqi Chen <[email protected]>
weibang6liu · Oct 17, 2021 · 4f64e93 · 4f64e93
1 parent d1afbf6
commit 4f64e93
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/src/cc/export/helpers.h b/src/cc/export/helpers.h
@@ -1309,16 +1309,16 @@ int name(unsigned long long *ctx) \
 static int ____##name(unsigned long long *ctx, ##args)
 
 #define KFUNC_PROBE(event, args...) \
- BPF_PROG(kfunc__ ## event, args)
+ BPF_PROG(kfunc__ ## event, ##args)
 
 #define KRETFUNC_PROBE(event, args...) \
- BPF_PROG(kretfunc__ ## event, args)
+ BPF_PROG(kretfunc__ ## event, ##args)
 
 #define KMOD_RET(event, args...) \
- BPF_PROG(kmod_ret__ ## event, args)
+ BPF_PROG(kmod_ret__ ## event, ##args)
 
 #define LSM_PROBE(event, args...) \
- BPF_PROG(lsm__ ## event, args)
+ BPF_PROG(lsm__ ## event, ##args)
 
 #define BPF_ITER(target) \
  int bpf_iter__ ## target (struct bpf_iter__ ## target *ctx)