Re: [PATCH 1/4] net: if_arp: add ARPHRD_PUREIP type

Does changelog mean adding these details to the commit message ?

Yes please.

will do.

quoted

quoted

And are these user-visable flags documented in a man page or something
else somewhere?  If not, how does userspace know about them?

There are mappings of these device types value in the libc:
"/bionic/libc/kernel/uapi/linux/if_arp.h".
userspace can get it from here.

Yes, they will show up in a libc definition, but where is it documented
in text form what the flag does?

Judging from the changes of ARPHRD_xxx submitted before, I am sorry
I could not find the corresponding doucuments to describe their 
respective behaviors in details. Perhaps the best way to understand
their behaviors is to read the code directly.

Thanks,
Rocco