On 27/10/16 22:38, Michael Ellerman wrote: > On Thu, 2016-13-10 at 02:17:14 UTC, Nicholas Piggin wrote: >> This patch does a couple of things. First of all, powernv immediately >> explodes when running a relocated kernel, because the system reset >> exception for handling sleeps does not do correct relocated branches. >> >> Secondly, the sleep handling code trashes the condition and cfar >> registers, which we would like to preserve for debugging purposes (for >> non-sleep case exception). >> >> This patch changes the exception to use the standard format that saves >> registers before any tests or branches are made. It adds the test for >> idle-wakeup as an "extra" to break out of the normal exception path. >> Then it branches to a relocated idle handler that calls the various >> idle handling functions. >> >> After this patch, POWER8 CPU simulator now boots powernv kernel that is >> running at non-zero. >> >> Cc: Balbir Singh <bsinghar...@gmail.com> >> Cc: Shreyas B. Prabhu <shre...@linux.vnet.ibm.com> >> Cc: Gautham R. Shenoy <e...@linux.vnet.ibm.com> >> Signed-off-by: Nicholas Piggin <npig...@gmail.com> >> Acked-by: Gautham R. Shenoy <e...@linux.vnet.ibm.com> >> Acked-by: Balbir Singh <bsinghar...@gmail.com> > > Applied to powerpc fixes, thanks. > > https://git.kernel.org/powerpc/c/fb479e44a9e240a23c2d208c2ace23 > BTW, this cannot be directly marked back to stable (ref: http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=fb479e44a9e240a23c2d208c2ace23542a47f41c)
For stable, we might need https://marc.info/?l=linuxppc-embedded&m=146967183624811&w=4 Balbir Singh
