Date: Mon, 18 Apr 2011 17:05:18 -0400 From: John Baldwin <jhb@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: svn-src-head@freebsd.org, Roman Divacky <rdivacky@freebsd.org>, src-committers@freebsd.org, Dimitry Andric <dim@freebsd.org>, svn-src-all@freebsd.org Subject: Re: svn commit: r220755 - in head: . contrib/gcc/doc contrib/gcc/objc contrib/libobjc etc/mtree gnu/lib gnu/lib/libobjc gnu/usr.bin/cc gnu/usr.bin/cc/cc1obj gnu/usr.bin/cc/cc_tools gnu/usr.bin/cc/doc s... Message-ID: <201104181705.18809.jhb@freebsd.org> In-Reply-To: <FCA75B5F-CCE4-431E-BA5E-C5828297F4E3@bsdimp.com> References: <201104172103.p3HL3Ntb049564@svn.freebsd.org> <201104181448.39401.jhb@freebsd.org> <FCA75B5F-CCE4-431E-BA5E-C5828297F4E3@bsdimp.com>
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On Monday, April 18, 2011 4:02:10 pm Warner Losh wrote: > > On Apr 18, 2011, at 12:48 PM, John Baldwin wrote: > > > On Monday, April 18, 2011 1:06:42 pm Warner Losh wrote: > >> > >> On Apr 18, 2011, at 1:01 AM, Roman Divacky wrote: > >> > >>> please mark this in src/UPDATING, maybe bump freebsd_version too? > >> > >> Please do not bump freebsd_version just for this. Ports wishing to know can go off the last bump, if there are any. > >> > >> Every freebsd_version bump forces rebuilding all modules and such and is a pita. > > > > No, what it breaks is building a module with a newer source tree than your > > running kernel and trying to kldload it. That is never really supported, > > but the kernel only notices when a version bump happens. The real fix there > > is to run a kernel + modules that are in sync on test boxes. > > The problem is that this is a technical solution that precludes me from saying "look, I know that this will be OK, so let me do it" I know nothing has changed that would cause a problem. We could easily support some sort of cpp #define to disable the automatic MODULE_DEPEND() on the kernel. Then you could use 'make DEBUG_FLAGS="-DDISABLE_KERNEL_VERSION"' or whatever the variable is called when building your kernel modules. You could even have a DISABLE_KERNEL_VERSION make variable that adds that to CFLAGS in bsd.kmod.mk and then set it to yes in your /etc/make.conf. However, for normal users I think the precaution against loading an 8.x kld on 7 is worth it. -- John Baldwin
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