[PATCH] x86_64: clear_bss before set_intr_gate with early_idt_handler
idt_table is in the .bss section, so clear_bss need to called at first

Signed-off-by: Yinghai Lu <yinghai.lu@amd.com> 

diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c
index 9561eb3..cc230b9 100644
--- a/arch/x86_64/kernel/head64.c
+++ b/arch/x86_64/kernel/head64.c
@@ -57,10 +57,12 @@ void __init x86_64_start_kernel(char * r
 {
 	int i;
 
-	for (i = 0; i < 256; i++)
+	/* clear bss before set_intr_gate with early_idt_handler */
+	clear_bss();
+
+	for (i = 0; i < IDT_ENTRIES; i++)
 		set_intr_gate(i, early_idt_handler);
 	asm volatile("lidt %0" :: "m" (idt_descr));
-	clear_bss();
 
 	early_printk("Kernel alive\n");