Re: [PATCH v4.4 backport 10/16] powerpc/64s: Convert slb_miss_common to use RFI_TO_USER/KERNEL
From: Greg KH <hidden>
Date: 2018-02-04 11:30:17
Also in:
stable
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