[RFC] SysV SHM on 64-bit platforms

[Alfred Perlstein]

* Jung-uk Kim <jkim at FreeBSD.org> [080119 00:05] wrote:
> While I was working on kern/113218, I realized it is a bigger problem 
> than I originally thought:
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=113218
> 
> Because fixing this PR breaks ABI, I had to make compat shims.  But 
> the question is which branch to break?  Since we are very close to 
> 7.0-RELEASE, the question became more complicated.  A lot of people 
> are asking me to fix this PR because it is much needed fix for large 
> database installations, so I have to make a quick decision. :-(

I think this is a step forward so it's not so bad, just make sure
to talk to "re@" about your MFCs, if it'll work out.

> 
> I think I have four options (with corresponding patches):
> - Option 1: HEAD.
> - Option 2: HEAD and RELENG_7.
> - Option 3: HEAD, RELENG_7, and RELENG_7_0.
> - Option 4: Don't do anything ATM.  Break it with ipc_perm later.

I like option 3 if possible.

> FYI, fixing ipc_perm is a lot more complicated and very intrusive.

Why does ipc_perm need fixing?

-- 
- Alfred Perlstein