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Le 02/08/2017 à 16:42, Kamil Rytarowski a écrit :
On 02.08.2017 15:27, Johnny Billquist wrote:
On 2017-08-02 14:44, Maxime Villard wrote:
Le 02/08/2017 à 14:21, Kamil Rytarowski a écrit :
On 02.08.2017 11:34, Maxime Villard wrote:
I see that the Vax GENERIC kernel has COMPAT_IBCS2 enabled by default.
But what
exactly is it doing here? iBCS2 is a standard designed for x86 CPUs,
it has
nothing to do with Vax.

Is there something that I'm missing? If so, it would be good to
enlighten the
man page.


This looks like SVR3 compatibility, x86 variation of it is called IBCS2.

Yes, I guessed that when reading the entry in GENERIC; but shouldn't
it be
renamed, or at least, made a little less confusing? In the man page for
example, we could say that iBCS2 stands for SVR3 on Vax, even if it is

I would vote for renaming. iBCS2 is something that is totally cryptic to
me. SVR3 is something I would expect most people to understand what it is.
But I suspect that also means renaming it for the x86 folks, and I
wonder how easy it might be to get them onboard.


I would keep it as it is, and improve documentation.

That's what I would do too.

In fact, I don't understand for which specific purpose compat_ibcs2 was
written. Was it written to be a compat for SVR3, but called iBCS2 for some
reason? (in which case, it would be suspicious to have it on i386.) Or was it
intended to be the real x86-specific iBCS2? (in which case, it would be
suspicious to have it on Vax.)

The man page is not particularly enlightening, and I fear that in order to
figure out which compat (or which mix of both) compat_ibcs2 was meant to be,
we will have to read the code and compare it with the iBCS2 specification. I
couldn't find this spec on the internet.


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