Re: PR/50410 no netbsd32 compat w/o nfsserver

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

The following reply was made to PR kern/50410; it has been noted by GNATS.

From: Paul Goyette <paul%vps1.whooppee.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: PR/50410 no netbsd32 compat w/o nfsserver
Date: Mon, 30 Nov 2015 10:20:42 +0800 (PHT)

 (resend since first time doesn't seem to have gone through)
 
 > Please note that my original case was a custom kernel w/o any module
 > support and everything build in (but no NFS server).
 > 
 > I agree that the module is hard to fix (and may not be worth to try),
 > but the non-MODULAR case should either fail to build or just work.
 
 The problem is actually wider than just nfsserver.
 
 The compat_netbsd32 module also assumes other optional components are
 available in the base kernel, for example SYSV{SEM,SHM,MSG}.  If you
 try to load the current compat_netbsd32 module on a kernel which does
 not include the SYSV options, you get undefined symbol errors.  This
 would generally mean that the module needs to depend on some other
 module which provides those symbols.
 
 However, adding "sysv_ipc" to the list of required modules for compat_netbsd32 
 will prevent a built-in variant of the compat_netbsd32 module from 
 initializing.
 
 The general problem is that the compat_netbsd32 module assumes that all of the 
 required non-compat code is built-in to the kernel, rather than being 
 optionally loaded.  There are two possible solutions:
 
 * Reduce the granularity of modularity for the base kernel, or
 * Split the compat_netbsd32 module into corresponding multiple modules which 
 can be individually loaded (ie, compat_netbsd32_sysv_ipc, 
 compat_netbsd32_nfsserver, etc.)
 
 I'm working on the latter approach.  It will take some time to implement and 
 test.
 
 
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