On 1/2/14, 11:14 AM, John-Mark Gurney wrote:
Konstantin Belousov wrote this message on Thu, Jan 02, 2014 at 15:13 +0200:
Afaik you could just remove the "spare" and steal 2 or 4 entries from
_kf_ispare until it is sorted.
Yes, this would work for current cap_rights_t structure, at least for
i386 and amd64, but would only allow to expand the structure by one
uint64_t in the future (which might or might not be enough). The
cap_rights_t structure is designed to be expanded to 5 uint64_ts without
breaking ABI. I don't want to stuck with current cap_rights_t that is
designed to expand, but cannot be, because kinfo_file wasn't modified at
the start of a major branch.
The ABI stability is not limited to the single branch. It must be
preserved across whole project lifetime.
Umm. when did this policy change happen? I thought ABI compatibility
was limited to major releases of FreeBSD? How are you suppose to do
any work if you can't break ABI ever?
I did a quick search for "freebsd policy abi breakage" and found some
mailing list posts about this, but no authoritative statement...
Of course the problem is that when we move to
(ASN.1/libnv/ctf/YAML/JSON/XML/etc) we will break ABI compatibility too,
or introduce tons of compatibility code that will rot...
I agree, however there is a very easy way to fix it for the time being.
Let's not be binary about it "well it's going to have to break, so let's
break it!" when such an easy way to not break it exists. It should be
"let's see if there's a non-intrusive way of not breaking it" and the
answer to that seems to be "yes".
-Alfred
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