[PATCH v3 0/2] context tracker support for arm64

Implement and enable context tracking for arm64 (which is a prerequisite for FULL_NOHZ support). This patchset builds upon earlier work by Kevin Hilman and is based on 3.15-rc2.

Changes v2 to v3:

* Save/restore necessary registers in ct_user_enter and ct_user_exit * Annotate "error paths" out of el0_sync with ct_user_exit

Changes v1 to v2:

* Save far_el1 in x26 temporarily

Larry Bassel (2): arm64: adjust el0_sync so that a function can be called arm64: enable context tracking

arch/arm64/Kconfig | 1 + arch/arm64/include/asm/thread_info.h | 1 + arch/arm64/kernel/entry.S | 76 ++++++++++++++++++++++++++++++++---- 3 files changed, 70 insertions(+), 8 deletions(-)