BPF_F_FAST_STACK_CMP
if (hash_matches && flags & BPF_F_FAST_STACK_CMP)
BPF_F_FAST_STACK_CMP | BPF_F_REUSE_STACKID)))
BPF_F_FAST_STACK_CMP | BPF_F_REUSE_STACKID)))
#define STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP)
#define KERN_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP)
#define USER_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP | BPF_F_USER_STACK)
BPF_F_FAST_STACK_CMP | stack_skip);
BPF_F_FAST_STACK_CMP | BPF_F_USER_STACK);