Argument list to `BPF_HASH()` too long when using offcpu.py example

Hi there, I'm trying to write a similar cpu profiling script as to the offcpu one in this repo. At the moment, I'm using the actual offcpu script, and I am getting

```
error: could not open bpf map: Argument list too long is maps/hash map type enabled in your kernel?

BPF_HASH(counts, struct key_t);
^
```

1. This error message strikes me as odd, since if it is that the argument list is too long, why would it matter if I have the type enabled in my kernel.

2. Is it actually that I need to enable the type or is the argument list actually too long?

Start with the offcpu.py example and the BPF_HASH(counts, struct key_t) declaration shown in the report. Reproduce the failure, then trace where the error is emitted and compare the wording with the kernel map-support check; done means the cause is identified and the diagnostic or documentation clearly distinguishes the two cases.

Written by the indexing model from the issue text.