Re: [Linux-stable-mirror] [PATCH v4.4 backport 10/16] powerpc/64s: Convert slb_miss_common to use RFI_TO_USER/KERNEL

On Sun, Feb 04, 2018 at 04:00:04PM +1100, Michael Ellerman wrote:

From: Nicholas Piggin npiggin@gmail.com

commit c7305645eb0c1621351cfc104038831ae87c0053 upstream.

In the SLB miss handler we may be returning to user or kernel. We need to add a check early on and save the result in the cr4 register, and then we bifurcate the return path based on that.

Signed-off-by: Nicholas Piggin npiggin@gmail.com [mpe: Backport to 4.4 based on patch from Balbir] Signed-off-by: Michael Ellerman mpe@ellerman.id.au

---

arch/powerpc/kernel/exceptions-64s.S | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-)

also applied to 4.9.y