On Sat, Nov 14, 2015 at 7:35 AM, Paul Goyette <p...@vps1.whooppee.com> wrote: > On Fri, 13 Nov 2015, David Holland wrote: > >> On Fri, Nov 13, 2015 at 04:41:18PM +0000, David Holland wrote: >> > On Fri, Nov 13, 2015 at 08:05:25PM +0800, Paul Goyette wrote: >> > > One final attempt to summarize the objections that have been made: >> > > [snip] >> > >> > One other thing: posix semaphores used to be a module. That code was >> > made the victim^W showpiece for demonstrating how the New World Order >> > was going to be. When the New World Order turned out to be broken, >> > that and other things were rolled back after a lengthy political >> > squabble. >> > >> > Part of the resistance you're seeing is the legacy of that squabble, >> > even though people probably don't really want to say so. >> >> One other point: the changes add mechanism, and that mechanism has a >> cost (in maintenance if nothing else) -- if the changes are more or >> less pointless as a number of people think, then we'd be paying that >> cost for zero or negligible benefit. That does seem like a valid >> reason to oppose such changes. > > > The mechanisms are currently still included. When the ksem module was > removed, the only thing that was done was removal of the modular variant > from the build. All of the "module mechanisms" still remain. The > current ksem_modcmd() even continues to use syscall_establish() to > "install" the syscalls, and those syscalls are still listed in the table > of autoload-able syscalls (in sys/kern/syscalls_autoload.c) and are > marked as such in syscalls.master.
I wonder if syscall_disestablish() can track syscall use (l->l_sysent), when it return back to userland by tsleep(PCATCH), then another syscall is called and l->l_sysent is overwritten? > > >> for my part during the above-mentioned squabble I made it pretty clear >> that I think aggressive use of kernel modules is at best tilting at >> windmills; I stand by that position, but I'm not really interested in >> fighting about it at the moment so I won't stick my oar in any >> further. > > > :) > > > > +------------------+--------------------------+-------------------------+ > | Paul Goyette | PGP Key fingerprint: | E-mail addresses: | > | (Retired) | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com | > | Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd.org | > +------------------+--------------------------+-------------------------+
