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Index: head/sys/amd64/amd64/cpu_switch.S
===================================================================
--- head/sys/amd64/amd64/cpu_switch.S
+++ head/sys/amd64/amd64/cpu_switch.S
@@ -209,14 +209,11 @@
done_tss:
movq %r8,PCPU(RSP0)
movq %r8,PCPU(CURPCB)
- /* Update the TSS_RSP0 pointer for the next interrupt */
- cmpq $~0,PCPU(UCR3)
- je 1f
movq PCPU(PTI_RSP0),%rax
+ cmpq $~0,PCPU(UCR3)
+ cmove %r8,%rax
movq %rax,TSS_RSP0(%rdx)
- jmp 2f
-1: movq %r8,TSS_RSP0(%rdx)
-2: movq %r12,PCPU(CURTHREAD) /* into next thread */
+ movq %r12,PCPU(CURTHREAD) /* into next thread */
/* Test if debug registers should be restored. */
testl $PCB_DBREGS,PCB_FLAGS(%r8)

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