Pile o' entry/exit/sp0 changes

Hi all-

Here we go again! I haven't done most of the requested label renaming, nor have I done Brian's reordering of the SYSCALL return code, mainly because I want to keep the ball rolling. As for label renaming, I'd rather let everyone finish arguing and then rename any labels at the end. I personally don't mind longish asm labels.

Changes from v1:
- Comment improvements.
- Lots of Reviewed-bys added.
- Fix vm86 bug.
- Completely remove RESTORE_..._REGS_... (Linus) -- adds two patches.

Changes from the old RFC version:
- Rebase
- Add Juergen's patch
- Add some assertions
- Cleanups

Andy Lutomirski (19):
x86/asm/64: Remove the restore_c_regs_and_iret label x86/asm/64: Split the iret-to-user and iret-to-kernel paths x86/asm/64: Move SWAPGS into the common iret-to-usermode path x86/asm/64: Simplify reg restore code in the standard IRET paths x86/asm/64: Shrink paranoid_exit_restore and make labels local x86/asm/64: Use pop instead of movq in syscall_return_via_sysret x86/asm/64: Merge the fast and slow SYSRET paths x86/entry/64: Use POP instead of MOV to restore regs on NMI return x86/entry/64: Remove the RESTORE_..._REGS infrastructure x86/asm/64: De-Xen-ify our NMI code
x86/asm/32: Pull MSR_IA32_SYSENTER_CS update code out of

    native_load_sp0()

x86/asm/64: Pass sp0 directly to load_sp0()
x86/asm: Add task_top_of_stack() to find the top of a task's stack x86/xen/64: Clean up SP code in cpu_initialize_context() x86/boot/64: Stop initializing TSS.sp0 at boot
x86/asm/64: Remove all remaining direct thread_struct::sp0 reads x86/boot/32: Fix cpu_current_top_of_stack initialization at boot x86/asm/64: Remove thread_struct::sp0
x86/traps: Use a new on_thread_stack() helper to clean up an assertion

Juergen Gross (1):
xen: add xen nmi trap entry

 arch/x86/entry/calling.h              |  69 +++++------------
 arch/x86/entry/entry_64.S             | 139 ++++++++++++++++++++--------------
 arch/x86/entry/entry_64_compat.S      |   3 +-
 arch/x86/include/asm/compat.h         |   1 +
 arch/x86/include/asm/paravirt.h       |   5 +-
 arch/x86/include/asm/paravirt_types.h |   2 +-
 arch/x86/include/asm/processor.h      |  52 +++++--------
 arch/x86/include/asm/switch_to.h      |  24 ++++++
 arch/x86/include/asm/traps.h          |   2 +-
 arch/x86/kernel/cpu/common.c          |  12 ++-
 arch/x86/kernel/head_64.S             |   2 +-
 arch/x86/kernel/process.c             |   8 +-
 arch/x86/kernel/process_32.c          |   6 +-
 arch/x86/kernel/process_64.c          |   5 +-
 arch/x86/kernel/smpboot.c             |   3 +-
 arch/x86/kernel/traps.c               |   3 +-
 arch/x86/kernel/vm86_32.c             |  20 ++---
 arch/x86/xen/enlighten_pv.c           |   9 +--
 arch/x86/xen/smp_pv.c                 |  17 ++++-
 arch/x86/xen/xen-asm_64.S             |   2 +-
 20 files changed, 208 insertions(+), 176 deletions(-)

2.13.6