How to compile ZFS only ?

[Steven Hartland]

In addition to the main zfs module there are also dependency modules which
are required.

If you're able to test loading the module on a non-zfs root machine by
manually loading it, it should detail any issues in /var/log/messages.

That said the method listed by Xin is the quickest and easiest solution.

On Wed, 22 Mar 2017 at 22:43, Xin LI <delphij at gmail.com> wrote:

> Why not just -DNO_CLEAN= with 'make buildkernel'?
>
> But to answer your question, 'make buildkernel' will take e.g.
> 'KERNCONF' aka kernel build configuration into account, while if you
> do make directly, it's not (and sometimes build options in the kernel
> build configuration, like WITNESS, etc., have material impact to data
> structure layouts).
>
> On Wed, Mar 22, 2017 at 2:47 PM, Ben RUBSON <ben.rubson at gmail.com> wrote:
> > Thank you for your answer Steven.
> > Unfortunately it did not help, same behaviour :
> > Module with you method has the same smaller size, 2323000 bytes vs
> 2500544.
> > (I then did not try to boot with it)
> >
> > Ben
> >
> >> On 22 Mar 2017, at 22:09, Steven Hartland <killing at multiplay.co.uk>
> wrote:
> >>
> >> cd /usr/src
> >> make buildenv
> >> cd sys/modules/zfs/
> >> make
> >> make install
> >>
> >> On 22/03/2017 20:57, Ben RUBSON wrote:
> >>> Hi,
> >>>
> >>> I'm trying to rebuild ZFS (with some patches) without having to
> rebuild whole kernel.
> >>>
> >>> What I then try :
> >>> # cd /usr/src/sys/modules/zfs/
> >>> # make
> >>> # cp zfs.ko /boot/kernel/ #to replace current zfs module
> >>>
> >>> But then server does not reboot properly (/ is on ZFS).
> >>>
> >>> If I do :
> >>> # cd /usr/src/
> >>> # make buildkernel KERNCONF=GENERIC
> >>> # cp
> /usr/obj/usr/src/sys/GENERIC/modules/usr/src/sys/modules/zfs/zfs.ko
> /boot/kernel/
> >>>
> >>> Then server correctly reboot.
> >>>
> >>> I clearly see that zfs.ko in method 1 is slightly smaller that in
> method 2.
> >>>
> >>> Am I missing something ? (of course yes, but what ? :)
> >>>
> >>> Many thanks !
> >>>
> >>> Best regards,
> >>>
> >>> Ben
> >>>
> >>> _______________________________________________
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> >>
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