On Wed, Jun 29, 2022 at 10:37:36AM +0100, Dimitri John Ledkov wrote:
> From: Kevin Hao <haokexin@xxxxxxxxx>
>
> commit d9e5c3e9e75162f845880535957b7fd0b4637d23 upstream.
>
> When the mmu_feature_keys[] was introduced in the commit c12e6f24d413
> ("powerpc: Add option to use jump label for mmu_has_feature()"),
> it is unlikely that it would be used either directly or indirectly in
> the out of tree modules. So we exported it as GPL only.
>
> But with the evolution of the codes, especially the PPC_KUAP support, it
> may be indirectly referenced by some primitive macro or inline functions
> such as get_user() or __copy_from_user_inatomic(), this will make it
> impossible to build many non GPL modules (such as ZFS) on ppc
> architecture. Fix this by exposing the mmu_feature_keys[] to the non-GPL
> modules too.
>
> Fixes: 7613f5a66bec ("powerpc/64s/kuap: Use mmu_has_feature()")
> Reported-by: Nathaniel Filardo <nwfilardo@xxxxxxxxx>
> Signed-off-by: Kevin Hao <haokexin@xxxxxxxxx>
> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/20220329085709.4132729-1-haokexin@xxxxxxxxx
>
> Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@xxxxxxxxxxxxx>
> ---
>
> Please apply this patch to v5.15+ as it unbreaks zfs-dkms usage on
> powerpc platforms.
Sorry, but for obvious reasons, I am not allowed to do anything related
to zfs code. Please feel free to keep this in your distro kernel if you
need it there.
greg k-h
