[PATCH 3/3] x86/irq: update first_system_vector only when X86_LOCAL_PIC is on

[Jianyu Zhan]

During native_init_IRQ(), we will update first_system_vector conditionally
when we init system vector. But on !CONFIG_X86_LOCAL_PIC, we prefer it
to NR_IRQS, so don't bother set it on this case.

Signed-off-by: Jianyu Zhan <nasa4836@xxxxxxxxx>
---
 arch/x86/include/asm/desc.h | 2 ++
 arch/x86/kernel/irqinit.c   | 3 ---
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 4e10d73..4fc2deb 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -383,8 +383,10 @@ static inline void alloc_system_vector(int vector)
 {
 	if (!test_bit(vector, used_vectors)) {
 		set_bit(vector, used_vectors);
+#ifdef CONFIG_X86_LOCAL_APIC
 		if (first_system_vector > vector)
 			first_system_vector = vector;
+#endif
 	} else {
 		BUG();
 	}
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 0e9fa7c..e999b38 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -188,9 +188,6 @@ void __init native_init_IRQ(void)
 	 * 'special' SMP interrupts)
 	 */
 	i = FIRST_EXTERNAL_VECTOR;
-#ifndef CONFIG_X86_LOCAL_APIC
-#define first_system_vector NR_VECTORS
-#endif
 	for_each_clear_bit_from(i, used_vectors, first_system_vector) {
 		/* IA32_SYSCALL_VECTOR could be used in trap_init already. */
 		set_intr_gate(i, irq_entries_start +
-- 
2.4.3