diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index 1c7f13bb6728..98da0d3c0b1a 100644
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -341,7 +341,10 @@ For 32-bit we have the following conventions - kernel is built with
 #endif
 .endm
 
-#endif /* CONFIG_X86_64 */
+#else /* CONFIG_X86_64 */
+# undef		UNWIND_HINT_IRET_REGS
+# define	UNWIND_HINT_IRET_REGS
+#endif /* !CONFIG_X86_64 */
 
 .macro STACKLEAK_ERASE
 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 158a5250ebc5..40092c81dcb8 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1215,40 +1215,15 @@ SYM_FUNC_END(entry_INT80_32)
 #endif
 .endm
 
-/*
- * Build the entry stubs with some assembler magic.
- * We pack 1 stub into every 8-byte block.
- */
-	.align 8
-SYM_CODE_START(irq_entries_start)
-    vector=FIRST_EXTERNAL_VECTOR
-    .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR)
-	pushl	$(~vector+0x80)			/* Note: always in signed byte range */
-    vector=vector+1
-	jmp	common_interrupt
-	.align	8
-    .endr
-SYM_CODE_END(irq_entries_start)
-
 #ifdef CONFIG_X86_LOCAL_APIC
-	.align 8
-SYM_CODE_START(spurious_entries_start)
-    vector=FIRST_SYSTEM_VECTOR
-    .rept (NR_VECTORS - FIRST_SYSTEM_VECTOR)
-	pushl	$(~vector+0x80)			/* Note: always in signed byte range */
-    vector=vector+1
-	jmp	common_spurious
-	.align	8
-    .endr
-SYM_CODE_END(spurious_entries_start)
-
 SYM_CODE_START_LOCAL(common_spurious)
 	ASM_CLAC
-	addl	$-0x80, (%esp)			/* Adjust vector into the [-256, -1] range */
 	SAVE_ALL switch_stacks=1
 	ENCODE_FRAME_POINTER
 	TRACE_IRQS_OFF
 	movl	%esp, %eax
+	movl	PT_ORIG_EAX(%esp), %edx		/* get the vector from stack */
+	movl	$-1, PT_ORIG_EAX(%esp)		/* no syscall to restart */
 	call	smp_spurious_interrupt
 	jmp	ret_from_intr
 SYM_CODE_END(common_spurious)
@@ -1261,12 +1236,12 @@ SYM_CODE_END(common_spurious)
 	.p2align CONFIG_X86_L1_CACHE_SHIFT
 SYM_CODE_START_LOCAL(common_interrupt)
 	ASM_CLAC
-	addl	$-0x80, (%esp)			/* Adjust vector into the [-256, -1] range */
-
 	SAVE_ALL switch_stacks=1
 	ENCODE_FRAME_POINTER
 	TRACE_IRQS_OFF
 	movl	%esp, %eax
+	movl	PT_ORIG_EAX(%esp), %edx		/* get the vector from stack */
+	movl	$-1, PT_ORIG_EAX(%esp)		/* no syscall to restart */
 	call	do_IRQ
 	jmp	ret_from_intr
 SYM_CODE_END(common_interrupt)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 76993591fdf6..e7434cda9a38 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -358,34 +358,6 @@ SYM_CODE_START(ret_from_fork)
 SYM_CODE_END(ret_from_fork)
 .popsection
 
-/*
- * Build the entry stubs with some assembler magic.
- * We pack 1 stub into every 8-byte block.
- */
-	.align 8
-SYM_CODE_START(irq_entries_start)
-    vector=FIRST_EXTERNAL_VECTOR
-    .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR)
-	UNWIND_HINT_IRET_REGS
-	pushq	$(~vector+0x80)			/* Note: always in signed byte range */
-	jmp	common_interrupt
-	.align	8
-	vector=vector+1
-    .endr
-SYM_CODE_END(irq_entries_start)
-
-	.align 8
-SYM_CODE_START(spurious_entries_start)
-    vector=FIRST_SYSTEM_VECTOR
-    .rept (NR_VECTORS - FIRST_SYSTEM_VECTOR)
-	UNWIND_HINT_IRET_REGS
-	pushq	$(~vector+0x80)			/* Note: always in signed byte range */
-	jmp	common_spurious
-	.align	8
-	vector=vector+1
-    .endr
-SYM_CODE_END(spurious_entries_start)
-
 .macro DEBUG_ENTRY_ASSERT_IRQS_OFF
 #ifdef CONFIG_DEBUG_ENTRY
 	pushq %rax
@@ -755,13 +727,14 @@ _ASM_NOKPROBE(interrupt_entry)
 /* Interrupt entry/exit. */
 
 /*
- * The interrupt stubs push (~vector+0x80) onto the stack and
+ * The interrupt stubs push vector onto the stack and
  * then jump to common_spurious/interrupt.
  */
 SYM_CODE_START_LOCAL(common_spurious)
-	addq	$-0x80, (%rsp)			/* Adjust vector to [-256, -1] range */
 	call	interrupt_entry
 	UNWIND_HINT_REGS indirect=1
+	movq	ORIG_RAX(%rdi), %rsi		/* get vector from stack */
+	movq	$-1, ORIG_RAX(%rdi)		/* no syscall to restart */
 	call	smp_spurious_interrupt		/* rdi points to pt_regs */
 	jmp	ret_from_intr
 SYM_CODE_END(common_spurious)
@@ -770,10 +743,11 @@ _ASM_NOKPROBE(common_spurious)
 /* common_interrupt is a hotpath. Align it */
 	.p2align CONFIG_X86_L1_CACHE_SHIFT
 SYM_CODE_START_LOCAL(common_interrupt)
-	addq	$-0x80, (%rsp)			/* Adjust vector to [-256, -1] range */
 	call	interrupt_entry
 	UNWIND_HINT_REGS indirect=1
-	call	do_IRQ	/* rdi points to pt_regs */
+	movq	ORIG_RAX(%rdi), %rsi		/* get vector from stack */
+	movq	$-1, ORIG_RAX(%rdi)		/* no syscall to restart */
+	call	do_IRQ				/* rdi points to pt_regs */
 	/* 0(%rsp): old RSP */
 ret_from_intr:
 	DISABLE_INTERRUPTS(CLBR_ANY)
@@ -1022,7 +996,7 @@ apicinterrupt RESCHEDULE_VECTOR			reschedule_interrupt		smp_reschedule_interrupt
 #endif
 
 apicinterrupt ERROR_APIC_VECTOR			error_interrupt			smp_error_interrupt
-apicinterrupt SPURIOUS_APIC_VECTOR		spurious_interrupt		smp_spurious_interrupt
+apicinterrupt SPURIOUS_APIC_VECTOR		spurious_apic_interrupt		smp_spurious_apic_interrupt
 
 #ifdef CONFIG_IRQ_WORK
 apicinterrupt IRQ_WORK_VECTOR			irq_work_interrupt		smp_irq_work_interrupt
diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
index 416422762845..cd57ce6134c9 100644
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -35,7 +35,7 @@ BUILD_INTERRUPT(kvm_posted_intr_nested_ipi, POSTED_INTR_NESTED_VECTOR)
 
 BUILD_INTERRUPT(apic_timer_interrupt,LOCAL_TIMER_VECTOR)
 BUILD_INTERRUPT(error_interrupt,ERROR_APIC_VECTOR)
-BUILD_INTERRUPT(spurious_interrupt,SPURIOUS_APIC_VECTOR)
+BUILD_INTERRUPT(spurious_apic_interrupt,SPURIOUS_APIC_VECTOR)
 BUILD_INTERRUPT(x86_platform_ipi, X86_PLATFORM_IPI_VECTOR)
 
 #ifdef CONFIG_IRQ_WORK
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 4154bc5f6a4e..0ffe80792b2d 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -39,6 +39,7 @@ extern asmlinkage void irq_work_interrupt(void);
 extern asmlinkage void uv_bau_message_intr1(void);
 
 extern asmlinkage void spurious_interrupt(void);
+extern asmlinkage void spurious_apic_interrupt(void);
 extern asmlinkage void thermal_interrupt(void);
 extern asmlinkage void reschedule_interrupt(void);
 
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 36e5b929389b..2fc0dc8af2a4 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -347,6 +347,54 @@ __visible noinstr void func(struct pt_regs *regs,			\
 #define DECLARE_IDTENTRY_XEN(vector, func)				\
 	idtentry vector asm_exc_xen##func exc_##func has_error_code=0
 
+/*
+ * ASM code to emit the common vector entry stubs where each stub is
+ * packed into 8 bytes.
+ *
+ * Note, that the 'pushq imm8' is emitted via '.byte 0x6a, vector' because
+ * GCC treats the local vector variable as unsigned int and would expand
+ * all vectors above 0x7F to a 5 byte push. The original code did an
+ * adjustment of the vector number to be in the signed byte range to avoid
+ * this. While clever it's mindboggling counterintuitive and requires the
+ * odd conversion back to a real vector number in the C entry points. Using
+ * .byte achieves the same thing and the only fixup needed in the C entry
+ * point is to mask off the bits above bit 7 because the push is sign
+ * extending.
+ */
+	.align 8
+SYM_CODE_START(irq_entries_start)
+    vector=FIRST_EXTERNAL_VECTOR
+    pos = .
+    .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR)
+	UNWIND_HINT_IRET_REGS
+	.byte	0x6a, vector
+	jmp	common_interrupt
+	nop
+	/* Ensure that the above is 8 bytes max */
+	. = pos + 8
+    pos=pos+8
+    vector=vector+1
+    .endr
+SYM_CODE_END(irq_entries_start)
+
+#ifdef CONFIG_X86_LOCAL_APIC
+	.align 8
+SYM_CODE_START(spurious_entries_start)
+    vector=FIRST_SYSTEM_VECTOR
+    pos = .
+    .rept (NR_VECTORS - FIRST_SYSTEM_VECTOR)
+	UNWIND_HINT_IRET_REGS
+	.byte	0x6a, vector
+	jmp	common_spurious
+	nop
+	/* Ensure that the above is 8 bytes max */
+	. = pos + 8
+    pos=pos+8
+    vector=vector+1
+    .endr
+SYM_CODE_END(spurious_entries_start)
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 /*
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index 72fba0eeeb30..74690a373c58 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -36,7 +36,7 @@ extern void native_init_IRQ(void);
 
 extern void handle_irq(struct irq_desc *desc, struct pt_regs *regs);
 
-extern __visible void do_IRQ(struct pt_regs *regs);
+extern __visible void do_IRQ(struct pt_regs *regs, unsigned long vector);
 
 extern void init_ISA_irqs(void);
 
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index d7de360eec74..32b2becf7806 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -41,8 +41,9 @@ asmlinkage void smp_deferred_error_interrupt(struct pt_regs *regs);
 #endif
 
 void smp_apic_timer_interrupt(struct pt_regs *regs);
-void smp_spurious_interrupt(struct pt_regs *regs);
 void smp_error_interrupt(struct pt_regs *regs);
+void smp_spurious_apic_interrupt(struct pt_regs *regs);
+void smp_spurious_interrupt(struct pt_regs *regs, unsigned long vector);
 asmlinkage void smp_irq_move_cleanup_interrupt(void);
 
 #ifdef CONFIG_VMAP_STACK
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 4b1d31be50b4..6c2b807a7eae 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2120,15 +2120,29 @@ void __init register_lapic_address(unsigned long address)
  * Local APIC interrupts
  */
 
-/*
- * This interrupt should _never_ happen with our APIC/SMP architecture
+/**
+ * smp_spurious_interrupt - Catch all for interrupts raised on unused vectors
+ * @regs:	Pointer to pt_regs on stack
+ * @error_code:	The vector number is in the lower 8 bits
+ *
+ * This is invoked from ASM entry code to catch all interrupts which
+ * trigger on an entry which is routed to the common_spurious idtentry
+ * point.
+ *
+ * Also called from smp_spurious_apic_interrupt().
  */
-__visible void __irq_entry smp_spurious_interrupt(struct pt_regs *regs)
+__visible void __irq_entry smp_spurious_interrupt(struct pt_regs *regs,
+						  unsigned long vector)
 {
-	u8 vector = ~regs->orig_ax;
 	u32 v;
 
 	entering_irq();
+	/*
+	 * The push in the entry ASM code which stores the vector number on
+	 * the stack in the error code slot is sign expanding. Just use the
+	 * lower 8 bits.
+	 */
+	vector &= 0xFF;
 	trace_spurious_apic_entry(vector);
 
 	inc_irq_stat(irq_spurious_count);
@@ -2149,11 +2163,11 @@ __visible void __irq_entry smp_spurious_interrupt(struct pt_regs *regs)
 	 */
 	v = apic_read(APIC_ISR + ((vector & ~0x1f) >> 1));
 	if (v & (1 << (vector & 0x1f))) {
-		pr_info("Spurious interrupt (vector 0x%02x) on CPU#%d. Acked\n",
+		pr_info("Spurious interrupt (vector 0x%02lx) on CPU#%d. Acked\n",
 			vector, smp_processor_id());
 		ack_APIC_irq();
 	} else {
-		pr_info("Spurious interrupt (vector 0x%02x) on CPU#%d. Not pending!\n",
+		pr_info("Spurious interrupt (vector 0x%02lx) on CPU#%d. Not pending!\n",
 			vector, smp_processor_id());
 	}
 out:
@@ -2161,6 +2175,11 @@ __visible void __irq_entry smp_spurious_interrupt(struct pt_regs *regs)
 	exiting_irq();
 }
 
+__visible void smp_spurious_apic_interrupt(struct pt_regs *regs)
+{
+	smp_spurious_interrupt(regs, SPURIOUS_APIC_VECTOR);
+}
+
 /*
  * This interrupt should never happen with our APIC/SMP architecture
  */
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index ddb11154aeee..20408e31c18d 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -145,7 +145,7 @@ static const __initconst struct idt_data apic_idts[] = {
 #ifdef CONFIG_X86_UV
 	INTG(UV_BAU_MESSAGE,		uv_bau_message_intr1),
 #endif
-	INTG(SPURIOUS_APIC_VECTOR,	spurious_interrupt),
+	INTG(SPURIOUS_APIC_VECTOR,	spurious_apic_interrupt),
 	INTG(ERROR_APIC_VECTOR,		error_interrupt),
 #endif
 };
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 252065d32ab5..c7669363251a 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -227,14 +227,18 @@ u64 arch_irq_stat(void)
  * SMP cross-CPU interrupts have their own specific
  * handlers).
  */
-__visible void __irq_entry do_IRQ(struct pt_regs *regs)
+__visible void __irq_entry do_IRQ(struct pt_regs *regs, unsigned long vector)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
-	struct irq_desc * desc;
-	/* high bit used in ret_from_ code  */
-	unsigned vector = ~regs->orig_ax;
+	struct irq_desc *desc;
 
 	entering_irq();
+	/*
+	 * The push in the entry ASM code which stores the vector number on
+	 * the stack in the error code slot is sign expanding. Just use the
+	 * lower 8 bits.
+	 */
+	vector &= 0xFF;
 
 	/* entering_irq() tells RCU that we're not quiescent.  Check it. */
 	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
@@ -249,7 +253,7 @@ __visible void __irq_entry do_IRQ(struct pt_regs *regs)
 		ack_APIC_irq();
 
 		if (desc == VECTOR_UNUSED) {
-			pr_emerg_ratelimited("%s: %d.%d No irq handler for vector\n",
+			pr_emerg_ratelimited("%s: %d.%lu No irq handler for vector\n",
 					     __func__, smp_processor_id(),
 					     vector);
 		} else {