Akshay Adiga <akshay.ad...@linux.vnet.ibm.com> writes: > On Fri, Mar 08, 2019 at 12:16:11PM +1100, Michael Ellerman wrote: >> In order to implement KUAP (Kernel Userspace Access Protection) on >> Power9 we will be using the AMR, and therefore indirectly the >> UAMOR/AMOR. >> >> So save/restore these regs in the idle code. >> >> Signed-off-by: Michael Ellerman <m...@ellerman.id.au> >> --- >> v5: Unchanged. >> v4: New. >> >> arch/powerpc/kernel/idle_book3s.S | 27 +++++++++++++++++++++++---- >> 1 file changed, 23 insertions(+), 4 deletions(-) > > Opps.. i posted a comment on the v4. > > It would be good if we can make AMOR/UAMOR/AMR save-restore > code power9 only.
Yes that would be a good optimisation. If you can send an incremental patch against this one I'll squash it in. If not I'll try and get it done at some point before merging. cheers
