Re: Regarding the ULTRIX and OSF1 compats

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Sun, Mar 17, 2019 at 05:41:18AM +0800, Paul Goyette wrote:
> On Sat, 16 Mar 2019, Maxime Villard wrote:
> 
> > Regarding COMPAT_OSF1: I'm not totally sure, but it seems that Alpha's
> > COMPAT_LINUX uses COMPAT_OSF1 as dependency (even if there is no proper
> > dependency in the module), because there are osf1_* calls. Some more
> > compat mess to untangle, it seems...
> > 
> > In all cases, it's only a few functions that are just wrappers, so it
> > probably shouldn't be too complicated to solve.
> 
> It's a total of 15 functions (I generated this list by building an alpha
> GENERIC kernel with COMPAT_OSF1 removed):
> 
>         osf1_sys_wait4
>         osf1_sys_mount

[...]

There's a funny historical reason for this -- Linux on Alpha originally
used OSF/1 syscall numbering and args for its own native syscalls.

No, our implementation need not actually reflect that -- but it's an
interesting historical detail perhaps we should write down somewhere.