From: Lai Jiangshan <laijs@xxxxxxxxxxxxxxxxx>
Changed from V5:
Fix the code order of FENCE_SWAPGS_KERNEL_ENTRY in patch1 and
change the new corresponding C entry code to match the asm code.
Squash the patch of removing stack-protector from traps.c into
a later patch that uses C entry code for #DB and #MCE
Kill .Lgs_change and use the new asm_load_gs_index_gs_change in
_ASM_EXTABLE
s/ETNRY/ENTRY/g for DEFINE_IDTENTRY_IST_ENTRY macros
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